feat(i18n): add EN/DE language support with next-intl

- Install next-intl@4 with cookie-based locale switching (NEXT_LOCALE) - Add LanguageSwitcher component in Sidebar footer - Translate Nav, PostTypeSheet, Feed, Explore, WelcomeCard, PetForm, AvatarUpload, and Onboarding pages (EN + DE) - Add SpeciesTranslation and BreedTranslation DB models for locale-aware taxonomy; listSpecies and listBreeds accept optional locale param - Seed German translations for all 3 species and 45 breeds - Add SQL migration script for Supabase (add_i18n_translations.sql) - fix(invite): secure cookie flag and set-invite route for HTTPS
2026-06-22 14:01:16 +02:00
1 parent 8645421c1e
commit 4b17537a9a
@@ -0,0 +1,106 @@
+{
+  "Nav": {
+    "home": "Startseite",
+    "myPets": "Meine Tiere",
+    "explore": "Entdecken",
+    "search": "Suchen",
+    "notifications": "Benachrichtigungen",
+    "messages": "Nachrichten",
+    "invite": "Einladen",
+    "newPost": "Beitrag erstellen",
+    "addPet": "Tier hinzufügen",
+    "account": "Konto",
+    "profile": "Profil"
+  },
+  "PostType": {
+    "title": "Erstellen",
+    "photo": "Foto-Beitrag",
+    "story": "Story",
+    "video": "Video-Beitrag",
+    "milestone": "Meilenstein",
+    "newPost": "Neuer Beitrag",
+    "newStory": "Neue Story",
+    "newMilestone": "Neuer Meilenstein",
+    "newVideo": "Neues Video"
+  },
+  "Feed": {
+    "emptyTitle": "Dein Feed ist leer",
+    "emptyBody": "Folge anderen Tieren, um ihre Beiträge hier zu sehen.",
+    "findPets": "Tiere entdecken"
+  },
+  "Welcome": {
+    "title": "Willkommen bei PawFeed!",
+    "subtitle": "Das kann dein Tier alles machen:",
+    "close": "Schließen",
+    "understood": "Verstanden",
+    "ctaHint": "Drücke + in der Navigation, um deinen ersten Beitrag zu erstellen.",
+    "photosTitle": "Fotos & Videos",
+    "photosDesc": "Teile Momente aus dem Leben deines Tieres — Einzelbilder, Karussells oder Kurzvideos.",
+    "storiesTitle": "Stories",
+    "storiesDesc": "24-Stunden-Stories verschwinden automatisch. Sieh, wer deine Story gesehen hat.",
+    "milestonesTitle": "Meilensteine",
+    "milestonesDesc": "Feiere Geburtstage, Adoptions-Jahrestage, erste Ausflüge und mehr.",
+    "dmsTitle": "Direktnachrichten",
+    "dmsDesc": "Schreibe anderen Tieren direkt — perfekt für Spielverabredungen oder Fragen.",
+    "healthTitle": "Gesundheitsakte",
+    "healthDesc": "Verfolge Gewicht, Impfungen und Tierarztbesuche. Teile die Gesundheitskarte mit deinem Tierarzt."
+  },
+  "Explore": {
+    "title": "Entdecken",
+    "trending": "Trending",
+    "all": "Alle",
+    "allBreeds": "Alle Rassen",
+    "loadMore": "Mehr laden",
+    "noPetsYet": "Noch keine {species}",
+    "noTrending": "Noch keine Trending-Inhalte — schau später wieder rein",
+    "trendingHashtags": "Trending-Hashtags",
+    "hotPosts": "Beliebte Beiträge · letzte 48 Std."
+  },
+  "PetForm": {
+    "name": "Name des Tieres",
+    "namePlaceholder": "Name eingeben",
+    "nameRequired": "Dieses Feld ist erforderlich.",
+    "nameMaxLength": "Der Name darf maximal 30 Zeichen lang sein.",
+    "species": "Tierart",
+    "selectSpecies": "Tierart auswählen",
+    "speciesRequired": "Bitte wähle eine Tierart aus.",
+    "breed": "Rasse",
+    "selectBreed": "Rasse auswählen (optional)",
+    "selectSpeciesFirst": "Wähle zuerst eine Tierart aus",
+    "noBreedsFound": "Keine Rassen gefunden.",
+    "bio": "Bio",
+    "adoptionStory": "Adoptionsgeschichte",
+    "birthday": "Geburtstag",
+    "birthdayHint": "Für Geburtstags-Erinnerungen",
+    "adoptedAt": "Adoptionsdatum",
+    "adoptedAtHint": "Für Jahrestags-Erinnerungen",
+    "addPet": "Tier anlegen",
+    "saveChanges": "Änderungen speichern",
+    "petCreated": "Tierprofil erstellt",
+    "changesSaved": "Änderungen gespeichert",
+    "error": "Etwas ist schiefgelaufen. Bitte versuche es erneut."
+  },
+  "AvatarUpload": {
+    "uploadPhoto": "Foto hochladen",
+    "changePhoto": "Foto ändern",
+    "savePetFirst": "Speichere dein Tier zuerst, um ein Foto hochzuladen.",
+    "uploadFailed": "Upload fehlgeschlagen — bitte versuche es erneut",
+    "photoUpdated": "Profilfoto aktualisiert",
+    "fileTooLarge": "Das Foto muss kleiner als 10 MB sein.",
+    "invalidType": "Lade ein JPG-, PNG- oder WebP-Bild hoch.",
+    "uploading": "Wird hochgeladen…"
+  },
+  "Onboarding": {
+    "addFirstPet": "Füge dein erstes Tier hinzu",
+    "addFirstPetDesc": "Dein Tier wird sein eigener Star auf PawFeed.",
+    "addPhoto": "Profilfoto hinzufügen",
+    "addPhotoDesc": "Gib deinem Tier ein Gesicht auf PawFeed. Du kannst das jederzeit ändern.",
+    "done": "Fertig",
+    "skipForNow": "Jetzt überspringen"
+  },
+  "Language": {
+    "switch": "Sprache",
+    "en": "English",
+    "de": "Deutsch"
+  }
+}
@@ -0,0 +1,106 @@
+{
+  "Nav": {
+    "home": "Home",
+    "myPets": "My Pets",
+    "explore": "Explore",
+    "search": "Search",
+    "notifications": "Notifications",
+    "messages": "Messages",
+    "invite": "Invite Friends",
+    "newPost": "New Post",
+    "addPet": "Add Pet",
+    "account": "Account",
+    "profile": "Profile"
+  },
+  "PostType": {
+    "title": "Create",
+    "photo": "Photo Post",
+    "story": "Story",
+    "video": "Video Post",
+    "milestone": "Milestone",
+    "newPost": "New Post",
+    "newStory": "New Story",
+    "newMilestone": "New Milestone",
+    "newVideo": "New Video"
+  },
+  "Feed": {
+    "emptyTitle": "Your feed is empty",
+    "emptyBody": "Follow some pets to see their posts here.",
+    "findPets": "Find Pets"
+  },
+  "Welcome": {
+    "title": "Welcome to PawFeed!",
+    "subtitle": "Here's what your pet can do:",
+    "close": "Close",
+    "understood": "Got it",
+    "ctaHint": "Press + in the nav to create your first post.",
+    "photosTitle": "Photos & Videos",
+    "photosDesc": "Share moments from your pet's life — single images, carousels, or short videos.",
+    "storiesTitle": "Stories",
+    "storiesDesc": "24 h stories disappear automatically. See who viewed your story.",
+    "milestonesTitle": "Milestones",
+    "milestonesDesc": "Celebrate birthdays, adoption anniversaries, first outings and more.",
+    "dmsTitle": "DMs",
+    "dmsDesc": "Message other pets directly — perfect for playdates or questions.",
+    "healthTitle": "Health Tracking",
+    "healthDesc": "Track weight, vaccinations and vet visits. Share the Health Card with your vet."
+  },
+  "Explore": {
+    "title": "Explore",
+    "trending": "Trending",
+    "all": "All",
+    "allBreeds": "All breeds",
+    "loadMore": "Load more",
+    "noPetsYet": "No {species} pets yet",
+    "noTrending": "No trending content yet — check back soon",
+    "trendingHashtags": "Trending hashtags",
+    "hotPosts": "Hot posts · last 48 h"
+  },
+  "PetForm": {
+    "name": "Pet name",
+    "namePlaceholder": "Enter pet name",
+    "nameRequired": "This field is required.",
+    "nameMaxLength": "Pet name must be 30 characters or fewer.",
+    "species": "Species",
+    "selectSpecies": "Select species",
+    "speciesRequired": "Please select a species.",
+    "breed": "Breed",
+    "selectBreed": "Select breed (optional)",
+    "selectSpeciesFirst": "Select a species first",
+    "noBreedsFound": "No breeds found.",
+    "bio": "Bio",
+    "adoptionStory": "Adoption story",
+    "birthday": "Birthday",
+    "birthdayHint": "For birthday reminders",
+    "adoptedAt": "Adoption date",
+    "adoptedAtHint": "For anniversary reminders",
+    "addPet": "Add Pet",
+    "saveChanges": "Save changes",
+    "petCreated": "Pet profile created",
+    "changesSaved": "Changes saved",
+    "error": "Something went wrong. Please try again."
+  },
+  "AvatarUpload": {
+    "uploadPhoto": "Upload photo",
+    "changePhoto": "Change photo",
+    "savePetFirst": "Save your pet first to upload a photo.",
+    "uploadFailed": "Upload failed — please try again",
+    "photoUpdated": "Profile photo updated",
+    "fileTooLarge": "Photo must be under 10 MB.",
+    "invalidType": "Upload a JPG, PNG, or WebP image.",
+    "uploading": "Uploading…"
+  },
+  "Onboarding": {
+    "addFirstPet": "Add your first pet",
+    "addFirstPetDesc": "Your pet will be their own star on PawFeed.",
+    "addPhoto": "Add a profile photo",
+    "addPhotoDesc": "Give your pet a face on PawFeed. You can always change this later.",
+    "done": "Done",
+    "skipForNow": "Skip for now"
+  },
+  "Language": {
+    "switch": "Language",
+    "en": "English",
+    "de": "Deutsch"
+  }
+}
@@ -1,4 +1,7 @@
 import type { NextConfig } from "next";
+import createNextIntlPlugin from "next-intl/plugin";
+
+const withNextIntl = createNextIntlPlugin("./src/i18n/request.ts");

 function getSupabaseHostname(): string {
  const url = process.env.NEXT_PUBLIC_SUPABASE_URL;
@@ -18,4 +21,4 @@ const nextConfig: NextConfig = {
  },
 };

-export default nextConfig;
+export default withNextIntl(nextConfig);
@@ -30,6 +30,7 @@
        "ioredis": "^5.11.1",
        "lucide-react": "^1.17.0",
        "next": "16.2.7",
+        "next-intl": "^4.13.0",
        "next-themes": "^0.4.6",
        "pg": "^8.21.0",
        "prisma": "^7.8.0",
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+      "resolved": "https://registry.npmjs.org/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-3.5.11.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@formatjs/intl-localematcher": {
+      "version": "0.8.10",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.8.10.tgz",
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    "node_modules/@hono/node-server": {
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@@ -3351,6 +3382,313 @@
        "url": "https://github.com/sponsors/Boshen"
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    "node_modules/possible-typed-array-names": {
      "version": "1.1.0",
      "resolved": "https://registry.npmjs.org/possible-typed-array-names/-/possible-typed-array-names-1.1.0.tgz",
@@ -13538,6 +14213,27 @@
        "punycode": "^2.1.0"
      }
    },
+    "node_modules/use-intl": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/use-intl/-/use-intl-4.13.0.tgz",
+      "integrity": "sha512-fAFDrWaASxlhXOipcOyb5VDD+YONqj6+8O8EcG/J7RBoOUF3A8YahRWLN+mBxYMrlMQB8N6Voqk5X+YC+HSL0A==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/amannn"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "^3.1.0",
+        "@schummar/icu-type-parser": "1.21.5",
+        "icu-minify": "^4.13.0",
+        "intl-messageformat": "^11.1.0"
+      },
+      "peerDependencies": {
+        "react": "^17.0.0 || ^18.0.0 || >=19.0.0-rc <19.0.0 || ^19.0.0"
+      }
+    },
    "node_modules/use-sync-external-store": {
      "version": "1.6.0",
      "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",
@@ -34,6 +34,7 @@
    "ioredis": "^5.11.1",
    "lucide-react": "^1.17.0",
    "next": "16.2.7",
+    "next-intl": "^4.13.0",
    "next-themes": "^0.4.6",
    "pg": "^8.21.0",
    "prisma": "^7.8.0",
@@ -0,0 +1,30 @@
+-- Migration: add_i18n_translations
+-- Creates SpeciesTranslation and BreedTranslation tables for locale-aware taxonomy.
+-- Run this directly on Supabase SQL Editor.
+
+CREATE TABLE IF NOT EXISTS "SpeciesTranslation" (
+  "id"        TEXT NOT NULL,
+  "speciesId" TEXT NOT NULL,
+  "locale"    TEXT NOT NULL,
+  "name"      TEXT NOT NULL,
+
+  CONSTRAINT "SpeciesTranslation_pkey" PRIMARY KEY ("id"),
+  CONSTRAINT "SpeciesTranslation_speciesId_locale_key" UNIQUE ("speciesId", "locale"),
+  CONSTRAINT "SpeciesTranslation_speciesId_fkey"
+    FOREIGN KEY ("speciesId") REFERENCES "Species"("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+CREATE TABLE IF NOT EXISTS "BreedTranslation" (
+  "id"      TEXT NOT NULL,
+  "breedId" TEXT NOT NULL,
+  "locale"  TEXT NOT NULL,
+  "name"    TEXT NOT NULL,
+
+  CONSTRAINT "BreedTranslation_pkey" PRIMARY KEY ("id"),
+  CONSTRAINT "BreedTranslation_breedId_locale_key" UNIQUE ("breedId", "locale"),
+  CONSTRAINT "BreedTranslation_breedId_fkey"
+    FOREIGN KEY ("breedId") REFERENCES "Breed"("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS "SpeciesTranslation_speciesId_idx" ON "SpeciesTranslation"("speciesId");
+CREATE INDEX IF NOT EXISTS "BreedTranslation_breedId_idx" ON "BreedTranslation"("breedId");
@@ -31,22 +31,44 @@ model InviteCode {
 }

 model Species {
-  id     String  @id @default(cuid())
-  name   String  @unique // "Dog" | "Cat" | "Bird"
-  breeds Breed[]
-  pets   Pet[]
+  id           String               @id @default(cuid())
+  name         String               @unique
+  breeds       Breed[]
+  pets         Pet[]
+  translations SpeciesTranslation[]
+}
+
+model SpeciesTranslation {
+  id        String  @id @default(cuid())
+  species   Species @relation(fields: [speciesId], references: [id])
+  speciesId String
+  locale    String
+  name      String
+
+  @@unique([speciesId, locale])
 }

 model Breed {
-  id        String  @id @default(cuid())
-  name      String
-  species   Species @relation(fields: [speciesId], references: [id])
-  speciesId String
-  pets      Pet[]
+  id           String             @id @default(cuid())
+  name         String
+  species      Species            @relation(fields: [speciesId], references: [id])
+  speciesId    String
+  pets         Pet[]
+  translations BreedTranslation[]

  @@unique([speciesId, name])
 }

+model BreedTranslation {
+  id      String @id @default(cuid())
+  breed   Breed  @relation(fields: [breedId], references: [id])
+  breedId String
+  locale  String
+  name    String
+
+  @@unique([breedId, locale])
+}
+
 model Pet {
  id            String   @id @default(cuid())
  owner         Owner    @relation(fields: [ownerId], references: [id])
@@ -75,6 +75,72 @@ const BIRD_BREEDS = [
  "Amazon Parrot",
 ];

+const SPECIES_DE: Record<string, string> = {
+  "Dog": "Hund",
+  "Cat": "Katze",
+  "Bird": "Vogel",
+};
+
+const DOG_BREEDS_DE: Record<string, string> = {
+  "Labrador Retriever": "Labrador Retriever",
+  "Golden Retriever": "Golden Retriever",
+  "German Shepherd": "Deutscher Schäferhund",
+  "French Bulldog": "Französische Bulldogge",
+  "Bulldog": "Bulldogge",
+  "Poodle": "Pudel",
+  "Beagle": "Beagle",
+  "Rottweiler": "Rottweiler",
+  "German Shorthaired Pointer": "Deutsch Kurzhaar",
+  "Dachshund": "Dackel",
+  "Pembroke Welsh Corgi": "Pembroke Welsh Corgi",
+  "Australian Shepherd": "Australian Shepherd",
+  "Yorkshire Terrier": "Yorkshire Terrier",
+  "Boxer": "Boxer",
+  "Cavalier King Charles Spaniel": "Cavalier King Charles Spaniel",
+  "Doberman Pinscher": "Dobermann",
+  "Great Dane": "Deutsche Dogge",
+  "Miniature Schnauzer": "Zwergschnauzer",
+  "Siberian Husky": "Sibirischer Husky",
+  "Border Collie": "Border Collie",
+};
+
+const CAT_BREEDS_DE: Record<string, string> = {
+  "Domestic Shorthair": "Europäisch Kurzhaar",
+  "Domestic Longhair": "Europäisch Langhaar",
+  "Maine Coon": "Maine Coon",
+  "Ragdoll": "Ragdoll",
+  "Siamese": "Siamkatze",
+  "Persian": "Perserkatze",
+  "Bengal": "Bengalkatze",
+  "British Shorthair": "Britisch Kurzhaar",
+  "Sphynx": "Sphynx",
+  "Scottish Fold": "Scottish Fold",
+  "American Shorthair": "Amerikanisch Kurzhaar",
+  "Abyssinian": "Abessinier",
+  "Norwegian Forest Cat": "Norwegische Waldkatze",
+  "Birman": "Heilige Birma",
+  "Russian Blue": "Russisch Blau",
+};
+
+const BIRD_BREEDS_DE: Record<string, string> = {
+  "Budgerigar (Budgie)": "Wellensittich",
+  "Cockatiel": "Nymphensittich",
+  "Lovebird": "Unzertrennliche",
+  "African Grey Parrot": "Graupapagei",
+  "Cockatoo": "Kakadu",
+  "Conure": "Sittich",
+  "Macaw": "Ara",
+  "Canary": "Kanarienvogel",
+  "Finch": "Fink",
+  "Amazon Parrot": "Amazone",
+};
+
+const BREED_DE_BY_SPECIES: Record<string, Record<string, string>> = {
+  "Dog": DOG_BREEDS_DE,
+  "Cat": CAT_BREEDS_DE,
+  "Bird": BIRD_BREEDS_DE,
+};
+
 async function main() {
  console.log("Seeding species...");

@@ -92,13 +158,34 @@ async function main() {
    });
    console.log(`  Upserted species: ${species.name} (${species.id})`);

+    const deSpeciesName = SPECIES_DE[s.name];
+    if (deSpeciesName) {
+      await prisma.speciesTranslation.upsert({
+        where: { speciesId_locale: { speciesId: species.id, locale: "de" } },
+        update: { name: deSpeciesName },
+        create: { speciesId: species.id, locale: "de", name: deSpeciesName },
+      });
+    }
+
    console.log(`  Seeding ${s.breeds.length} breeds for ${species.name}...`);
+    const breedDeMap = BREED_DE_BY_SPECIES[s.name] ?? {};
+
    for (const breedName of s.breeds) {
      const breed = await prisma.breed.upsert({
        where: { speciesId_name: { speciesId: species.id, name: breedName } },
        update: {},
        create: { speciesId: species.id, name: breedName },
      });
+
+      const deBreedName = breedDeMap[breedName];
+      if (deBreedName) {
+        await prisma.breedTranslation.upsert({
+          where: { breedId_locale: { breedId: breed.id, locale: "de" } },
+          update: { name: deBreedName },
+          create: { breedId: breed.id, locale: "de", name: deBreedName },
+        });
+      }
+
      console.log(`    Upserted breed: ${breed.name}`);
    }
  }
@@ -2,6 +2,7 @@

 import { useState } from "react";
 import Link from "next/link";
+import { useTranslations, useLocale } from "next-intl";
 import { useInfiniteQuery, useQuery } from "@tanstack/react-query";
 import { Loader2, TrendingUp } from "lucide-react";
 import { useTRPC } from "@/trpc/client";
@@ -23,6 +24,8 @@ import {
 import { Button } from "@/components/ui/button";

 export default function ExplorePage() {
+  const t = useTranslations("Explore");
+  const locale = useLocale();
  const trpc = useTRPC();
  const { activePetId } = useActivePet();

@@ -35,12 +38,12 @@ export default function ExplorePage() {
    activeTab === "trending" || activeTab === "all" ? null : activeTab;

  const { data: speciesList, isLoading: loadingSpecies } = useQuery(
-    trpc.pets.listSpecies.queryOptions()
+    trpc.pets.listSpecies.queryOptions({ locale })
  );

  const { data: breedData } = useQuery(
    trpc.pets.listBreeds.queryOptions(
-      { speciesId: activeSpeciesId ?? "" },
+      { speciesId: activeSpeciesId ?? "", locale },
      { enabled: !!activeSpeciesId }
    )
  );
@@ -88,15 +91,15 @@ export default function ExplorePage() {

  return (
    <div className="max-w-[640px] mx-auto px-4 py-6">
-      <h1 className="text-xl font-semibold mb-4">Explore</h1>
+      <h1 className="text-xl font-semibold mb-4">{t("title")}</h1>

      <Tabs value={activeTab} onValueChange={handleTabChange} className="mb-4">
        <TabsList>
          <TabsTrigger value="trending" className="gap-1">
            <TrendingUp className="h-3.5 w-3.5" />
-            Trending
+            {t("trending")}
          </TabsTrigger>
-          <TabsTrigger value="all">All</TabsTrigger>
+          <TabsTrigger value="all">{t("all")}</TabsTrigger>
          {(speciesList ?? []).map((s) => (
            <TabsTrigger key={s.id} value={s.id}>
              {s.name}
@@ -113,10 +116,10 @@ export default function ExplorePage() {
            onValueChange={(v) => setActiveBreedId(v === "all" ? null : v)}
          >
            <SelectTrigger className="w-[220px]">
-              <SelectValue placeholder="All breeds" />
+              <SelectValue placeholder={t("allBreeds")} />
            </SelectTrigger>
            <SelectContent>
-              <SelectItem value="all">All breeds</SelectItem>
+              <SelectItem value="all">{t("allBreeds")}</SelectItem>
              {breeds.map((b) => (
                <SelectItem key={b.id} value={b.id}>
                  {b.name}
@@ -144,14 +147,13 @@ export default function ExplorePage() {
          </div>
        ) : pets.length === 0 ? (
          <p className="text-sm text-muted-foreground text-center py-10">
-            No{" "}
-            {activeBreedId
-              ? (breeds.find((b) => b.id === activeBreedId)?.name ?? "breed")
-              : activeSpeciesId
-                ? ((speciesList ?? []).find((s) => s.id === activeSpeciesId)
-                    ?.name ?? "species")
-                : ""}{" "}
-            pets yet
+            {t("noPetsYet", {
+              species: activeBreedId
+                ? (breeds.find((b) => b.id === activeBreedId)?.name ?? "")
+                : activeSpeciesId
+                  ? ((speciesList ?? []).find((s) => s.id === activeSpeciesId)?.name ?? "")
+                  : "",
+            })}
          </p>
        ) : (
          <>
@@ -175,7 +177,7 @@ export default function ExplorePage() {
                  {isFetchingNextPage ? (
                    <Loader2 className="h-4 w-4 animate-spin mr-2" />
                  ) : null}
-                  Load more
+                  {t("loadMore")}
                </Button>
              </div>
            )}
@@ -239,6 +241,8 @@ function TrendingContent({
  isLoading: boolean;
  onSelectPost: (post: PostCardPost) => void;
 }) {
+  const t = useTranslations("Explore");
+
  if (isLoading) {
    return (
      <div className="flex justify-center py-16">
@@ -254,7 +258,7 @@ function TrendingContent({
  if (!hasContent) {
    return (
      <p className="text-sm text-muted-foreground text-center py-10">
-        No trending content yet — check back soon
+        {t("noTrending")}
      </p>
    );
  }
@@ -265,7 +269,7 @@ function TrendingContent({
      {hashtags.length > 0 && (
        <section>
          <h2 className="text-sm font-semibold text-muted-foreground uppercase tracking-wide mb-3">
-            Trending hashtags
+            {t("trendingHashtags")}
          </h2>
          <div className="flex flex-wrap gap-2">
            {hashtags.map((ht) => (
@@ -289,7 +293,7 @@ function TrendingContent({
      {posts.length > 0 && (
        <section>
          <h2 className="text-sm font-semibold text-muted-foreground uppercase tracking-wide mb-3">
-            Hot posts · last 48 h
+            {t("hotPosts")}
          </h2>
          <div className="grid grid-cols-3 gap-0.5">
            {posts.map((post) => {
@@ -1,22 +1,37 @@
 import { auth } from "@clerk/nextjs/server";
+import { NextRequest, NextResponse } from "next/server";
 import { cookies } from "next/headers";
-import { redirect } from "next/navigation";
 import { prisma } from "@/lib/prisma";
 import { generateInviteCode, INVITE_CODES_PER_USER } from "@/lib/invite-codes";

-export async function GET() {
+function resolveBase(request: NextRequest): string {
+  const proto = request.headers.get("x-forwarded-proto") ?? "https";
+  const host =
+    request.headers.get("x-forwarded-host") ??
+    request.headers.get("host") ??
+    "localhost:3000";
+  return `${proto}://${host}`;
+}
+
+export async function GET(request: NextRequest) {
  const { userId } = await auth();
-  if (!userId) redirect("/log-in");
+  const base = resolveBase(request);
+
+  if (!userId) {
+    return NextResponse.redirect(new URL("/log-in", base));
+  }

  const cookieStore = await cookies();
  const inviteCode = cookieStore.get("pf_invite")?.value;

+  const response = NextResponse.redirect(new URL("/", base));
+
  if (inviteCode) {
    await consumeInviteCode(userId, inviteCode);
-    cookieStore.delete("pf_invite");
+    response.cookies.delete("pf_invite");
  }

-  redirect("/");
+  return response;
 }

 async function consumeInviteCode(userId: string, code: string) {
@@ -0,0 +1,35 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "@/lib/prisma";
+
+function resolveBase(request: NextRequest): string {
+  const proto = request.headers.get("x-forwarded-proto") ?? "https";
+  const host =
+    request.headers.get("x-forwarded-host") ??
+    request.headers.get("host") ??
+    "localhost:3000";
+  return `${proto}://${host}`;
+}
+
+export async function GET(request: NextRequest) {
+  const code = request.nextUrl.searchParams.get("code")?.trim().toUpperCase();
+  const base = resolveBase(request);
+
+  if (!code) {
+    return NextResponse.redirect(new URL("/join?error=missing", base));
+  }
+
+  const invite = await prisma.inviteCode.findUnique({ where: { code } });
+  if (!invite || invite.usedById || invite.revoked) {
+    return NextResponse.redirect(new URL("/join?error=invalid", base));
+  }
+
+  const response = NextResponse.redirect(new URL("/sign-up", base));
+  response.cookies.set("pf_invite", code, {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === "production",
+    sameSite: "lax",
+    maxAge: 60 * 60,
+    path: "/",
+  });
+  return response;
+}
@@ -1,7 +1,5 @@
-"use server";
-
-import { cookies } from "next/headers";
 import { redirect } from "next/navigation";
+import { cookies } from "next/headers";
 import { prisma } from "@/lib/prisma";

 interface JoinPageProps {
@@ -23,7 +21,7 @@ async function submitCode(formData: FormData) {
    httpOnly: true,
    secure: process.env.NODE_ENV === "production",
    sameSite: "lax",
-    maxAge: 60 * 60, // 1 hour
+    maxAge: 60 * 60,
    path: "/",
  });
  redirect("/sign-up");
@@ -32,28 +30,17 @@ async function submitCode(formData: FormData) {
 export default async function JoinPage({ searchParams }: JoinPageProps) {
  const { code: codeParam, error } = await searchParams;

-  // If a code is in the URL, pre-validate and set cookie immediately
+  // Code in URL → hand off to route handler which can set cookies
  if (codeParam) {
-    const code = codeParam.trim().toUpperCase();
-    const invite = await prisma.inviteCode.findUnique({ where: { code } });
-    if (invite && !invite.usedById && !invite.revoked) {
-      const cookieStore = await cookies();
-      cookieStore.set("pf_invite", code, {
-        httpOnly: true,
-        sameSite: "lax",
-        maxAge: 60 * 60,
-        path: "/",
-      });
-      redirect("/sign-up");
-    }
-    // invalid code in URL — fall through and show form with error
+    redirect(`/api/auth/set-invite?code=${encodeURIComponent(codeParam)}`);
  }

  const errorMessage =
-    error === "invalid" ? "Ungültiger oder bereits verwendeter Einladungscode."
-    : error === "missing" ? "Bitte gib einen Einladungscode ein."
-    : codeParam ? "Dieser Einladungscode ist ungültig oder wurde bereits verwendet."
-    : null;
+    error === "invalid"
+      ? "Ungültiger oder bereits verwendeter Einladungscode."
+      : error === "missing"
+        ? "Bitte gib einen Einladungscode ein."
+        : null;

  return (
    <main className="min-h-screen flex items-center justify-center bg-zinc-950 px-4">
@@ -1,6 +1,8 @@
 import type { Metadata } from "next";
 import { Inter } from "next/font/google";
 import { ClerkProvider } from "@clerk/nextjs";
+import { NextIntlClientProvider } from "next-intl";
+import { getLocale, getMessages } from "next-intl/server";
 import { TRPCReactProvider } from "@/trpc/client";
 import { ActivePetProvider } from "@/context/ActivePetContext";
 import { Toaster } from "@/components/ui/sonner";
@@ -16,11 +18,14 @@ export const metadata: Metadata = {
  description: "The social platform where pets are the stars.",
 };

-export default function RootLayout({
+export default async function RootLayout({
  children,
 }: Readonly<{
  children: React.ReactNode;
 }>) {
+  const locale = await getLocale();
+  const messages = await getMessages();
+
  return (
    <ClerkProvider
      appearance={{
@@ -31,14 +36,16 @@ export default function RootLayout({
        },
      }}
    >
-      <html lang="en" className={`${inter.variable} h-full antialiased font-sans`}>
+      <html lang={locale} className={`${inter.variable} h-full antialiased font-sans`}>
        <body className="min-h-full flex flex-col">
-          <TRPCReactProvider>
-            <ActivePetProvider>
-              {children}
-              <Toaster />
-            </ActivePetProvider>
-          </TRPCReactProvider>
+          <NextIntlClientProvider locale={locale} messages={messages}>
+            <TRPCReactProvider>
+              <ActivePetProvider>
+                {children}
+                <Toaster />
+              </ActivePetProvider>
+            </TRPCReactProvider>
+          </NextIntlClientProvider>
        </body>
      </html>
    </ClerkProvider>
@@ -1,33 +1,65 @@
 "use client";

+import { useState } from "react";
 import { useRouter } from "next/navigation";
+import { useTranslations } from "next-intl";
 import { PetForm } from "@/components/pet/PetForm";
+import { AvatarUpload } from "@/components/pet/AvatarUpload";
+import { Button } from "@/components/ui/button";

 /**
 * Onboarding pet page — /onboarding/pet
 *
- * Shown when an authenticated owner has no pets yet (redirected from app layout).
- * Lives OUTSIDE the (app) layout group to avoid redirect loop:
- * app layout sees 0 pets → redirects here → this page has no pet check.
+ * Two-step flow:
+ * Step 1: Create pet profile (name, species, etc.)
+ * Step 2: Upload avatar photo (now that petId exists)
 *
- * On successful pet creation, redirects to /pets/[petId] (the new pet's profile).
- *
- * This is a client component because onSuccess uses router.push.
+ * Lives OUTSIDE the (app) layout group to avoid redirect loop.
 */
 export default function OnboardingPetPage() {
  const router = useRouter();
+  const t = useTranslations("Onboarding");
+  const [createdPetId, setCreatedPetId] = useState<string | null>(null);
+
+  if (createdPetId) {
+    return (
+      <main className="min-h-screen flex items-center justify-center bg-background px-4">
+        <div className="w-full max-w-[512px] p-8 flex flex-col items-center gap-6">
+          <div className="text-center">
+            <h1 className="text-xl font-semibold mb-2">{t("addPhoto")}</h1>
+            <p className="text-sm text-muted-foreground">{t("addPhotoDesc")}</p>
+          </div>
+
+          <AvatarUpload petId={createdPetId} onUploadComplete={() => {}} />
+
+          <div className="flex flex-col gap-2 w-full">
+            <Button
+              className="w-full"
+              onClick={() => router.push(`/pets/${createdPetId}`)}
+            >
+              {t("done")}
+            </Button>
+            <Button
+              variant="ghost"
+              className="w-full text-muted-foreground"
+              onClick={() => router.push(`/pets/${createdPetId}`)}
+            >
+              {t("skipForNow")}
+            </Button>
+          </div>
+        </div>
+      </main>
+    );
+  }

  return (
    <main className="min-h-screen flex items-center justify-center bg-background px-4">
      <div className="w-full max-w-[512px] p-8">
-        <h1 className="text-xl font-semibold mb-2">Add your first pet</h1>
-        <p className="text-sm text-muted-foreground mb-8">
-          Your pet will be their own star on PawFeed.
-        </p>
-
+        <h1 className="text-xl font-semibold mb-2">{t("addFirstPet")}</h1>
+        <p className="text-sm text-muted-foreground mb-8">{t("addFirstPetDesc")}</p>
        <PetForm
          mode="create"
-          onSuccess={(petId) => router.push(`/pets/${petId}`)}
+          onSuccess={(petId) => setCreatedPetId(petId)}
        />
      </div>
    </main>
@@ -1,37 +1,23 @@
 import Link from "next/link";
+import { getTranslations } from "next-intl/server";
 import { buttonVariants } from "@/components/ui/button";

-/**
- * EmptyFeed — shown when the active pet's feed has zero posts.
- *
- * D-06: pets with no follows land on feed with this empty state.
- * UI-SPEC copy (locked):
- *   - Heading: "Your feed is empty"
- *   - Body: "Follow some pets to see their posts here."
- *   - CTA: "Find Pets" → /explore (Phase 3 route — placeholder button)
- *
- * Note: shadcn base-nova uses @base-ui/react/button which does not support asChild.
- * Using Link with buttonVariants CSS classes directly.
- */
-export function EmptyFeed() {
+export async function EmptyFeed() {
+  const t = await getTranslations("Feed");
+
  return (
    <div className="flex flex-col items-center justify-center py-20 px-6 text-center">
-      {/* Heading — text-xl font-semibold per UI-SPEC typography */}
      <h2 className="text-xl font-semibold text-foreground">
-        Your feed is empty
+        {t("emptyTitle")}
      </h2>
-
-      {/* Body — text-sm per UI-SPEC */}
      <p className="mt-3 text-sm text-muted-foreground max-w-xs">
-        Follow some pets to see their posts here.
+        {t("emptyBody")}
      </p>
-
-      {/* Find Pets CTA — primary button style, links to /explore (Phase 3 placeholder) */}
      <Link
        href="/explore"
        className={buttonVariants({ variant: "default" }) + " mt-6 bg-orange-500 hover:bg-orange-600 text-white border-transparent"}
      >
-        Find Pets
+        {t("findPets")}
      </Link>
    </div>
  );
@@ -1,38 +1,20 @@
 "use client";

 import { useState, useEffect } from "react";
+import { useTranslations } from "next-intl";
 import { X, Camera, Flame, Heart, MessageCircle, Activity } from "lucide-react";
 import { Button } from "@/components/ui/button";

-const FEATURES = [
-  {
-    icon: Camera,
-    title: "Fotos & Videos",
-    desc: "Teile Momente aus dem Leben deines Haustieres — Einzelbilder, Karussells oder Kurzvideos.",
-  },
-  {
-    icon: Flame,
-    title: "Stories",
-    desc: "24h-Storys verschwinden automatisch. Sieh, wer deine Story angeschaut hat.",
-  },
-  {
-    icon: Heart,
-    title: "Meilensteine",
-    desc: "Feiere Geburtstage, Adoptions-Jahrestage, erste Ausflüge und mehr.",
-  },
-  {
-    icon: MessageCircle,
-    title: "DMs",
-    desc: "Schreibe anderen Pets direkt — perfekt für Spielverabredungen oder Fragen.",
-  },
-  {
-    icon: Activity,
-    title: "Health Tracking",
-    desc: "Verfolge Gewicht, Impfungen und Tierarztbesuche. Teile die Health Card mit dem Tierarzt.",
-  },
+const FEATURE_DEFS = [
+  { icon: Camera, titleKey: "photosTitle", descKey: "photosDesc" },
+  { icon: Flame, titleKey: "storiesTitle", descKey: "storiesDesc" },
+  { icon: Heart, titleKey: "milestonesTitle", descKey: "milestonesDesc" },
+  { icon: MessageCircle, titleKey: "dmsTitle", descKey: "dmsDesc" },
+  { icon: Activity, titleKey: "healthTitle", descKey: "healthDesc" },
 ] as const;

 export function WelcomeCard({ petId }: { petId: string }) {
+  const t = useTranslations("Welcome");
  const storageKey = `pf_welcome_seen_${petId}`;
  const [visible, setVisible] = useState(false);

@@ -54,16 +36,14 @@ export function WelcomeCard({ petId }: { petId: string }) {
        <div>
          <div className="flex items-center gap-2 mb-1">
            <span className="text-orange-500 text-lg">🐾</span>
-            <h2 className="text-base font-semibold">Willkommen bei PawFeed!</h2>
+            <h2 className="text-base font-semibold">{t("title")}</h2>
          </div>
-          <p className="text-sm text-muted-foreground">
-            Hier ist, was dein Haustier alles tun kann:
-          </p>
+          <p className="text-sm text-muted-foreground">{t("subtitle")}</p>
        </div>
        <button
          onClick={dismiss}
          className="text-muted-foreground hover:text-foreground transition-colors mt-0.5"
-          aria-label="Schließen"
+          aria-label={t("close")}
        >
          <X className="h-4 w-4" />
        </button>
@@ -71,14 +51,14 @@ export function WelcomeCard({ petId }: { petId: string }) {

      {/* Feature grid */}
      <div className="grid grid-cols-1 sm:grid-cols-2 gap-px bg-border mx-5 rounded-xl overflow-hidden border mb-4">
-        {FEATURES.map(({ icon: Icon, title, desc }) => (
-          <div key={title} className="flex items-start gap-3 p-4 bg-background/80">
+        {FEATURE_DEFS.map(({ icon: Icon, titleKey, descKey }) => (
+          <div key={titleKey} className="flex items-start gap-3 p-4 bg-background/80">
            <div className="mt-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-lg bg-orange-500/10">
              <Icon className="h-4 w-4 text-orange-500" />
            </div>
            <div>
-              <p className="text-sm font-medium leading-snug">{title}</p>
-              <p className="text-xs text-muted-foreground leading-snug mt-0.5">{desc}</p>
+              <p className="text-sm font-medium leading-snug">{t(titleKey)}</p>
+              <p className="text-xs text-muted-foreground leading-snug mt-0.5">{t(descKey)}</p>
            </div>
          </div>
        ))}
@@ -86,11 +66,9 @@ export function WelcomeCard({ petId }: { petId: string }) {

      {/* CTA */}
      <div className="flex items-center justify-between px-5 pb-5">
-        <p className="text-xs text-muted-foreground">
-          Drücke <span className="font-medium text-foreground">+</span> in der Navigation um deinen ersten Post zu erstellen.
-        </p>
+        <p className="text-xs text-muted-foreground">{t("ctaHint")}</p>
        <Button size="sm" variant="ghost" onClick={dismiss} className="shrink-0 text-xs">
-          Verstanden
+          {t("understood")}
        </Button>
      </div>
    </div>
@@ -0,0 +1,46 @@
+"use client";
+
+import { useLocale, useTranslations } from "next-intl";
+import { useRouter } from "next/navigation";
+import { useTransition } from "react";
+import { Globe } from "lucide-react";
+
+const LOCALES = [
+  { code: "en", label: "English" },
+  { code: "de", label: "Deutsch" },
+] as const;
+
+export function LanguageSwitcher() {
+  const locale = useLocale();
+  const router = useRouter();
+  const t = useTranslations("Language");
+  const [isPending, startTransition] = useTransition();
+
+  function switchLocale(next: string) {
+    document.cookie = `NEXT_LOCALE=${next};path=/;max-age=31536000;samesite=lax`;
+    startTransition(() => {
+      router.refresh();
+    });
+  }
+
+  return (
+    <div className="flex items-center gap-1 px-2 py-1.5 rounded-md text-muted-foreground">
+      <Globe className="h-3.5 w-3.5 shrink-0" />
+      <span className="text-xs">{t("switch")}:</span>
+      {LOCALES.map((l) => (
+        <button
+          key={l.code}
+          onClick={() => switchLocale(l.code)}
+          disabled={isPending || locale === l.code}
+          className={`text-xs px-1.5 py-0.5 rounded transition-colors ${
+            locale === l.code
+              ? "text-foreground font-medium bg-accent"
+              : "hover:text-foreground hover:bg-accent/60"
+          }`}
+        >
+          {l.label}
+        </button>
+      ))}
+    </div>
+  );
+}
@@ -10,6 +10,7 @@ import {
  User,
  ChevronDown,
 } from "lucide-react";
+import { useTranslations } from "next-intl";
 import { NotificationBell } from "@/components/notifications/NotificationBell";
 import { PostTypeSheet } from "@/components/post-creation/PostTypeSheet";
 import {
@@ -55,6 +56,7 @@ export function MobileNav({ pets }: MobileNavProps) {
  const router = useRouter();
  const { activePetId, setActivePet } = useActivePet();

+  const t = useTranslations("Nav");
  const activePet = pets.find((p) => p.id === activePetId) ?? pets[0];
  const [postTypeSheetOpen, setPostTypeSheetOpen] = useState(false);

@@ -126,7 +128,7 @@ export function MobileNav({ pets }: MobileNavProps) {
                className="flex items-center gap-2 cursor-pointer"
              >
                <span className="text-orange-500">+</span>
-                <span>Add Pet</span>
+                <span>{t("addPet")}</span>
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
@@ -146,7 +148,7 @@ export function MobileNav({ pets }: MobileNavProps) {
          }`}
        >
          <Home className="h-5 w-5" aria-hidden="true" />
-          <span>Home</span>
+          <span>{t("home")}</span>
        </Link>

        {/* Explore */}
@@ -157,7 +159,7 @@ export function MobileNav({ pets }: MobileNavProps) {
          }`}
        >
          <Compass className="h-5 w-5" aria-hidden="true" />
-          <span>Explore</span>
+          <span>{t("explore")}</span>
        </Link>

        {/* Post — center, accent-filled. D-01: opens PostTypeSheet */}
@@ -183,7 +185,7 @@ export function MobileNav({ pets }: MobileNavProps) {
          }`}
        >
          <User className="h-5 w-5" aria-hidden="true" />
-          <span>Profile</span>
+          <span>{t("profile")}</span>
        </Link>
      </nav>

@@ -15,8 +15,10 @@ import {
  Plus,
  Ticket,
 } from "lucide-react";
+import { useTranslations } from "next-intl";
 import { PostTypeSheet } from "@/components/post-creation/PostTypeSheet";
 import { NotificationBell } from "@/components/notifications/NotificationBell";
+import { LanguageSwitcher } from "@/components/i18n/LanguageSwitcher";
 import { UserButton } from "@clerk/nextjs";
 import {
  DropdownMenu,
@@ -42,14 +44,14 @@ type SidebarProps = {
 };

 const navLinks = [
-  { href: "/feed",          label: "Home",          icon: Home,          active: true,  special: false },
-  { href: "/pets",          label: "My Pets",        icon: Heart,         active: true,  special: false },
-  { href: "/explore",       label: "Explore",        icon: Compass,       active: true,  special: false },
-  { href: "/search",        label: "Search",         icon: Search,        active: true,  special: false },
-  { href: "/notifications", label: "Notifications",  icon: Bell,          active: true,  special: true  },
-  { href: "/messages",      label: "Messages",       icon: MessageCircle, active: true,  special: false },
-  { href: "/invite",        label: "Einladen",       icon: Ticket,        active: true,  special: false },
-];
+  { href: "/feed",          key: "home",          icon: Home,          active: true,  special: false },
+  { href: "/pets",          key: "myPets",        icon: Heart,         active: true,  special: false },
+  { href: "/explore",       key: "explore",       icon: Compass,       active: true,  special: false },
+  { href: "/search",        key: "search",        icon: Search,        active: true,  special: false },
+  { href: "/notifications", key: "notifications", icon: Bell,          active: true,  special: true  },
+  { href: "/messages",      key: "messages",      icon: MessageCircle, active: true,  special: false },
+  { href: "/invite",        key: "invite",        icon: Ticket,        active: true,  special: false },
+] as const;

 /**
 * Desktop sidebar — 240px fixed left nav visible at lg: breakpoint.
@@ -71,6 +73,7 @@ const navLinks = [
 export function Sidebar({ pets }: SidebarProps) {
  const pathname = usePathname();
  const router = useRouter();
+  const t = useTranslations("Nav");
  const { activePetId, setActivePet } = useActivePet();

  const activePet = pets.find((p) => p.id === activePetId) ?? pets[0];
@@ -144,7 +147,7 @@ export function Sidebar({ pets }: SidebarProps) {
                className="flex items-center gap-2 cursor-pointer"
              >
                <span className="text-orange-500">+</span>
-                <span>Add Pet</span>
+                <span>{t("addPet")}</span>
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
@@ -153,7 +156,8 @@ export function Sidebar({ pets }: SidebarProps) {

      {/* Nav links */}
      <div className="flex-1 px-3 py-2 space-y-1">
-        {navLinks.map(({ href, label, icon: Icon, active, special }) => {
+        {navLinks.map(({ href, key, icon: Icon, active, special }) => {
+          const label = t(key as Parameters<typeof t>[0]);
          const isCurrentPage =
            href === "/feed"
              ? pathname === "/feed" || pathname === "/"
@@ -205,10 +209,15 @@ export function Sidebar({ pets }: SidebarProps) {
          aria-label="Create post"
        >
          <Plus className="h-4 w-4 shrink-0" aria-hidden="true" />
-          <span>New Post</span>
+          <span>{t("newPost")}</span>
        </button>
      </div>

+      {/* Language switcher */}
+      <div className="px-1 pb-1">
+        <LanguageSwitcher />
+      </div>
+
      {/* Legal mini-footer */}
      <div className="px-4 pb-3 space-y-1">
        <div className="flex items-center gap-3 text-[11px] text-muted-foreground/60">
@@ -232,7 +241,7 @@ export function Sidebar({ pets }: SidebarProps) {
      {/* Bottom: owner identity */}
      <div className="px-4 py-4 border-t border flex items-center gap-2">
        <UserButton />
-        <span className="text-xs text-muted-foreground">Account</span>
+        <span className="text-xs text-muted-foreground">{t("account")}</span>
      </div>

      {/* PostTypeSheet — D-01: bottom Sheet with Photo/Story/Milestone choices */}
@@ -1,6 +1,7 @@
 "use client";

 import { useState, useRef, useCallback } from "react";
+import { useTranslations } from "next-intl";
 import { Camera, Loader2 } from "lucide-react";
 import { toast } from "sonner";
 import { useTRPC } from "@/trpc/client";
@@ -48,6 +49,7 @@ export function AvatarUpload({
  currentAvatarUrl,
  onUploadComplete,
 }: AvatarUploadProps) {
+  const t = useTranslations("AvatarUpload");
  const trpc = useTRPC();
  const fileInputRef = useRef<HTMLInputElement>(null);
  const [uploadState, setUploadState] = useState<UploadState>("idle");
@@ -78,19 +80,19 @@ export function AvatarUpload({
    async (file: File) => {
      // Disabled state guard — petId not yet available (create mode)
      if (!petId) {
-        toast.info("Save your pet first to upload a photo.");
+        toast.info(t("savePetFirst"));
        return;
      }

      // Client-side validation: file size
      if (file.size > MAX_FILE_SIZE) {
-        handleError("Photo must be under 10 MB.");
+        handleError(t("fileTooLarge"));
        return;
      }

      // Client-side validation: file type
      if (!ALLOWED_TYPES.includes(file.type as AllowedContentType)) {
-        handleError("Upload a JPG, PNG, or WebP image.");
+        handleError(t("invalidType"));
        return;
      }

@@ -147,9 +149,9 @@ export function AvatarUpload({

        // Step 5: Notify parent and show success toast
        onUploadComplete?.(key);
-        toast.success("Profile photo updated");
+        toast.success(t("photoUpdated"));
      } catch {
-        handleError("Upload failed — please try again");
+        handleError(t("uploadFailed"));
        setUploadState("error");
      }
    },
@@ -225,7 +227,7 @@ export function AvatarUpload({
        className="flex flex-col items-center justify-center gap-2 rounded-full w-32 h-32 border-dashed border-2 border-muted opacity-50 cursor-not-allowed mx-auto"
      >
        <Camera className="h-6 w-6 text-muted-foreground" aria-hidden="true" />
-        <span className="text-xs text-muted-foreground">Upload photo</span>
+        <span className="text-xs text-muted-foreground">{t("uploadPhoto")}</span>
      </div>
    );
  }
@@ -240,7 +242,7 @@ export function AvatarUpload({
            {localAvatarUrl ? (
              <AvatarImage
                src={localAvatarUrl}
-                alt="Uploading..."
+                alt={t("uploading")}
                className="opacity-50"
              />
            ) : (
@@ -262,7 +264,7 @@ export function AvatarUpload({
          </div>
        </div>
        <span className="text-xs text-muted-foreground">
-          {uploadProgress > 0 ? `${uploadProgress}%` : "Uploading…"}
+          {uploadProgress > 0 ? `${uploadProgress}%` : t("uploading")}
        </span>
      </div>
    );
@@ -288,7 +290,7 @@ export function AvatarUpload({
          onKeyDown={(e) => {
            if (e.key === "Enter" || e.key === " ") handleClick();
          }}
-          aria-label="Change profile photo"
+          aria-label={t("changePhoto")}
        >
          <Avatar className="w-32 h-32">
            <AvatarImage src={localAvatarUrl!} alt="Pet avatar" />
@@ -299,7 +301,7 @@ export function AvatarUpload({
          {/* Hover overlay */}
          <div className="absolute inset-0 flex flex-col items-center justify-center gap-1 rounded-full bg-black/50 opacity-0 group-hover:opacity-100 transition-opacity">
            <Camera className="h-6 w-6 text-white" aria-hidden="true" />
-            <span className="text-xs text-white font-medium">Change photo</span>
+            <span className="text-xs text-white font-medium">{t("changePhoto")}</span>
          </div>
        </div>
        {uploadState === "error" && errorMessage && (
@@ -335,10 +337,10 @@ export function AvatarUpload({
        onKeyDown={(e) => {
          if (e.key === "Enter" || e.key === " ") handleClick();
        }}
-        aria-label="Upload profile photo"
+        aria-label={t("uploadPhoto")}
      >
        <Camera className="h-6 w-6 text-muted-foreground" aria-hidden="true" />
-        <span className="text-xs text-muted-foreground">Upload photo</span>
+        <span className="text-xs text-muted-foreground">{t("uploadPhoto")}</span>
      </div>
      {isError && errorMessage && (
        <p className="text-xs text-destructive text-center max-w-[160px]">
@@ -1,6 +1,7 @@
 "use client";

 import { useState } from "react";
+import { useTranslations, useLocale } from "next-intl";
 import { useForm, Controller } from "react-hook-form";
 import { zodResolver } from "@hookform/resolvers/zod";
 import { z } from "zod";
@@ -73,6 +74,8 @@ export function PetForm({
  initialBirthday,
  initialAdoptedAt,
 }: PetFormProps) {
+  const t = useTranslations("PetForm");
+  const locale = useLocale();
  const trpc = useTRPC();
  const queryClient = useQueryClient();
  const [selectedSpeciesId, setSelectedSpeciesId] = useState<string>(
@@ -84,13 +87,13 @@ export function PetForm({
  );

  const { data: speciesList = [], isLoading: speciesLoading } = useQuery({
-    ...trpc.pets.listSpecies.queryOptions(),
+    ...trpc.pets.listSpecies.queryOptions({ locale }),
    staleTime: Infinity,
  });

  const { data: breedList = [], isLoading: breedsLoading } = useQuery({
    ...trpc.pets.listBreeds.queryOptions(
-      { speciesId: selectedSpeciesId || "__none__" },
+      { speciesId: selectedSpeciesId || "__none__", locale },
    ),
    enabled: !!selectedSpeciesId,
    staleTime: Infinity,
@@ -100,11 +103,11 @@ export function PetForm({
    ...trpc.pets.create.mutationOptions(),
    onSuccess: (pet) => {
      void queryClient.invalidateQueries();
-      toast.success("Pet profile created");
+      toast.success(t("petCreated"));
      onSuccess?.(pet.id);
    },
    onError: () => {
-      toast.error("Something went wrong. Please try again.");
+      toast.error(t("error"));
    },
  });

@@ -112,11 +115,11 @@ export function PetForm({
    ...trpc.pets.update.mutationOptions(),
    onSuccess: () => {
      void queryClient.invalidateQueries();
-      toast.success("Changes saved");
+      toast.success(t("changesSaved"));
      onSuccess?.(petId!);
    },
    onError: () => {
-      toast.error("Something went wrong. Please try again.");
+      toast.error(t("error"));
    },
  });

@@ -191,11 +194,11 @@ export function PetForm({

      {/* Pet name */}
      <div className="flex flex-col gap-1.5">
-        <Label htmlFor="pet-name">Pet name</Label>
+        <Label htmlFor="pet-name">{t("name")}</Label>
        <Input
          id="pet-name"
          maxLength={30}
-          placeholder="Enter pet name"
+          placeholder={t("namePlaceholder")}
          aria-invalid={!!errors.name}
          {...register("name")}
          onChange={(e) => {
@@ -211,7 +214,7 @@ export function PetForm({

      {/* Species selector — defer render until list loaded so SelectValue resolves names */}
      <div className="flex flex-col gap-1.5">
-        <Label htmlFor="species">Species</Label>
+        <Label htmlFor="species">{t("species")}</Label>
        {speciesLoading ? (
          <Skeleton className="h-9 w-full" />
        ) : (
@@ -233,7 +236,7 @@ export function PetForm({
                  aria-invalid={!!errors.speciesId}
                >
                  <span className={field.value ? "text-foreground" : "text-muted-foreground"}>
-                    {speciesList.find((s) => s.id === field.value)?.name ?? "Select species"}
+                    {speciesList.find((s) => s.id === field.value)?.name ?? t("selectSpecies")}
                  </span>
                </SelectTrigger>
                <SelectContent>
@@ -256,7 +259,7 @@ export function PetForm({

      {/* Breed selector — defer render until list loaded so SelectValue resolves names */}
      <div className="flex flex-col gap-1.5">
-        <Label htmlFor="breed">Breed</Label>
+        <Label htmlFor="breed">{t("breed")}</Label>
        {selectedSpeciesId && breedsLoading ? (
          <Skeleton className="h-9 w-full" />
        ) : (
@@ -276,16 +279,16 @@ export function PetForm({
                >
                  <span className={field.value ? "text-foreground" : "text-muted-foreground"}>
                    {field.value
-                      ? (breedList.find((b) => b.id === field.value)?.name ?? "Select breed (optional)")
+                      ? (breedList.find((b) => b.id === field.value)?.name ?? t("selectBreed"))
                      : selectedSpeciesId
-                        ? "Select breed (optional)"
-                        : "Select a species first"}
+                        ? t("selectBreed")
+                        : t("selectSpeciesFirst")}
                  </span>
                </SelectTrigger>
                <SelectContent>
                  {breedList.length === 0 ? (
                    <SelectItem value="__empty__" disabled>
-                      No breeds found for this species.
+                      {t("noBreedsFound")}
                    </SelectItem>
                  ) : (
                    breedList.map((breed) => (
@@ -306,7 +309,7 @@ export function PetForm({

      {/* Bio */}
      <div className="flex flex-col gap-1.5">
-        <Label htmlFor="bio">Bio</Label>
+        <Label htmlFor="bio">{t("bio")}</Label>
        <Textarea
          id="bio"
          maxLength={150}
@@ -324,7 +327,7 @@ export function PetForm({

      {/* Adoption story */}
      <div className="flex flex-col gap-1.5">
-        <Label htmlFor="adoption-story">Adoption story</Label>
+        <Label htmlFor="adoption-story">{t("adoptionStory")}</Label>
        <Textarea
          id="adoption-story"
          maxLength={500}
@@ -346,24 +349,24 @@ export function PetForm({
      {mode === "edit" && (
        <div className="grid grid-cols-2 gap-3">
          <div className="flex flex-col gap-1.5">
-            <Label htmlFor="birthday">Geburtstag</Label>
+            <Label htmlFor="birthday">{t("birthday")}</Label>
            <Input
              id="birthday"
              type="date"
              value={birthdayValue}
              {...register("birthday")}
            />
-            <p className="text-xs text-muted-foreground">Für Geburtstags-Erinnerungen</p>
+            <p className="text-xs text-muted-foreground">{t("birthdayHint")}</p>
          </div>
          <div className="flex flex-col gap-1.5">
-            <Label htmlFor="adopted-at">Adoptionstag</Label>
+            <Label htmlFor="adopted-at">{t("adoptedAt")}</Label>
            <Input
              id="adopted-at"
              type="date"
              value={adoptedAtValue}
              {...register("adoptedAt")}
            />
-            <p className="text-xs text-muted-foreground">Für Jahrestags-Erinnerungen</p>
+            <p className="text-xs text-muted-foreground">{t("adoptedAtHint")}</p>
          </div>
        </div>
      )}
@@ -371,7 +374,7 @@ export function PetForm({
      {/* Submit CTA */}
      <Button type="submit" disabled={isLoading} className="w-full">
        {isLoading && <Loader2 className="animate-spin" />}
-        {mode === "create" ? "Add Pet" : "Save changes"}
+        {mode === "create" ? t("addPet") : t("saveChanges")}
      </Button>
    </form>
  );
@@ -1,6 +1,7 @@
 "use client";

 import { useState } from "react";
+import { useTranslations } from "next-intl";
 import { Camera, BookOpen, Trophy, Video } from "lucide-react";
 import {
  Sheet,
@@ -44,6 +45,7 @@ interface PostTypeSheetProps {
 type PostType = "photo" | "story" | "milestone" | "video" | null;

 export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
+  const t = useTranslations("PostType");
  const [selectedType, setSelectedType] = useState<PostType>(null);
  const [photoDialogOpen, setPhotoDialogOpen] = useState(false);

@@ -90,7 +92,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
      <Sheet open={open} onOpenChange={onOpenChange}>
        <SheetContent side="bottom" className="pb-8">
          <SheetHeader className="mb-4">
-            <SheetTitle className="text-xl font-semibold">Create</SheetTitle>
+            <SheetTitle className="text-xl font-semibold">{t("title")}</SheetTitle>
          </SheetHeader>

          <div className="space-y-3">
@@ -101,7 +103,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
              onClick={() => handleSelectType("photo")}
            >
              <Camera className="h-5 w-5 text-orange-500 shrink-0" aria-hidden="true" />
-              <span>Photo Post</span>
+              <span>{t("photo")}</span>
            </Button>

            {/* Story option — seam for 02-05 */}
@@ -111,7 +113,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
              onClick={() => handleSelectType("story")}
            >
              <BookOpen className="h-5 w-5 text-orange-500 shrink-0" aria-hidden="true" />
-              <span>Story</span>
+              <span>{t("story")}</span>
            </Button>

            {/* Video Post option */}
@@ -121,7 +123,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
              onClick={() => handleSelectType("video")}
            >
              <Video className="h-5 w-5 text-orange-500 shrink-0" aria-hidden="true" />
-              <span>Video Post</span>
+              <span>{t("video")}</span>
            </Button>

            {/* Milestone option — seam for 02-06 */}
@@ -131,7 +133,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
              onClick={() => handleSelectType("milestone")}
            >
              <Trophy className="h-5 w-5 text-orange-500 shrink-0" aria-hidden="true" />
-              <span>Milestone</span>
+              <span>{t("milestone")}</span>
            </Button>
          </div>
        </SheetContent>
@@ -141,7 +143,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
      <Dialog open={photoDialogOpen} onOpenChange={setPhotoDialogOpen}>
        <DialogContent className="sm:max-w-[512px] max-h-[90dvh] overflow-y-auto p-0">
          <DialogHeader className="px-4 pt-4 pb-2">
-            <DialogTitle className="text-xl font-semibold">New Post</DialogTitle>
+            <DialogTitle className="text-xl font-semibold">{t("newPost")}</DialogTitle>
          </DialogHeader>
          <PhotoPostForm onClose={handlePhotoClose} />
        </DialogContent>
@@ -151,7 +153,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
      <Dialog open={storyDialogOpen} onOpenChange={setStoryDialogOpen}>
        <DialogContent className="sm:max-w-[512px] max-h-[90dvh] overflow-y-auto p-0">
          <DialogHeader className="px-4 pt-4 pb-2">
-            <DialogTitle className="text-xl font-semibold">New Story</DialogTitle>
+            <DialogTitle className="text-xl font-semibold">{t("newStory")}</DialogTitle>
          </DialogHeader>
          <StoryForm onClose={handleStoryClose} />
        </DialogContent>
@@ -161,7 +163,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
      <Dialog open={milestoneDialogOpen} onOpenChange={setMilestoneDialogOpen}>
        <DialogContent className="sm:max-w-[512px] max-h-[90dvh] overflow-y-auto p-0">
          <DialogHeader className="px-4 pt-4 pb-2">
-            <DialogTitle className="text-xl font-semibold">New Milestone</DialogTitle>
+            <DialogTitle className="text-xl font-semibold">{t("newMilestone")}</DialogTitle>
          </DialogHeader>
          <MilestoneForm onClose={handleMilestoneClose} />
        </DialogContent>
@@ -171,7 +173,7 @@ export function PostTypeSheet({ open, onOpenChange }: PostTypeSheetProps) {
      <Dialog open={videoDialogOpen} onOpenChange={setVideoDialogOpen}>
        <DialogContent className="sm:max-w-[512px] max-h-[90dvh] overflow-y-auto p-0">
          <DialogHeader className="px-4 pt-4 pb-2">
-            <DialogTitle className="text-xl font-semibold">New Video</DialogTitle>
+            <DialogTitle className="text-xl font-semibold">{t("newVideo")}</DialogTitle>
          </DialogHeader>
          <VideoUploadForm onClose={() => { setVideoDialogOpen(false); setSelectedType(null); }} />
        </DialogContent>
@@ -0,0 +1,19 @@
+import { getRequestConfig } from "next-intl/server";
+import { cookies } from "next/headers";
+
+const LOCALES = ["en", "de"] as const;
+export type Locale = (typeof LOCALES)[number];
+export const defaultLocale: Locale = "en";
+
+export default getRequestConfig(async () => {
+  const cookieStore = await cookies();
+  const raw = cookieStore.get("NEXT_LOCALE")?.value ?? "";
+  const locale: Locale = (LOCALES as readonly string[]).includes(raw)
+    ? (raw as Locale)
+    : defaultLocale;
+
+  return {
+    locale,
+    messages: (await import(`../../messages/${locale}.json`)).default,
+  };
+});
@@ -2,6 +2,7 @@ import { z } from "zod";
 import { TRPCError } from "@trpc/server";
 import { router, protectedProcedure } from "@/trpc/init";
 import type { PrismaClient } from "@prisma/client";
+import { generateInviteCode, INVITE_CODES_PER_USER } from "@/lib/invite-codes";

 /**
 * Ownership assertion helper — verifies that a pet belongs to the requesting
@@ -51,6 +52,19 @@ export const petsRouter = router({
        create: { id: ctx.userId },
      });

+      // Ensure every owner has starter invite codes (idempotent)
+      const existingCodes = await ctx.prisma.inviteCode.count({
+        where: { issuedById: ctx.userId },
+      });
+      if (existingCodes === 0) {
+        await ctx.prisma.inviteCode.createMany({
+          data: Array.from({ length: INVITE_CODES_PER_USER }, () => ({
+            code: generateInviteCode(),
+            issuedById: ctx.userId,
+          })),
+        });
+      }
+
      return ctx.prisma.pet.create({
        data: {
          ownerId: ctx.userId,
@@ -180,20 +194,36 @@ export const petsRouter = router({
   * List all species.
   * Protected procedure — auth required to prevent unauthenticated taxonomy scraping (T-3-04).
   */
-  listSpecies: protectedProcedure.query(async ({ ctx }) => {
-    return ctx.prisma.species.findMany({ orderBy: { name: "asc" } });
-  }),
-
-  /**
-   * List breeds for a given species.
-   * Protected procedure (T-3-04).
-   */
-  listBreeds: protectedProcedure
-    .input(z.object({ speciesId: z.string().min(1) }))
+  listSpecies: protectedProcedure
+    .input(z.object({ locale: z.string().optional() }).optional())
    .query(async ({ ctx, input }) => {
-      return ctx.prisma.breed.findMany({
-        where: { speciesId: input.speciesId },
+      const locale = input?.locale;
+      const species = await ctx.prisma.species.findMany({
+        include: locale ? { translations: { where: { locale }, take: 1 } } : undefined,
        orderBy: { name: "asc" },
      });
+      return species.map((s) => ({
+        id: s.id,
+        name: (locale && "translations" in s && (s as { translations: { name: string }[] }).translations[0]?.name)
+          ? (s as { translations: { name: string }[] }).translations[0].name
+          : s.name,
+      }));
+    }),
+
+  listBreeds: protectedProcedure
+    .input(z.object({ speciesId: z.string().min(1), locale: z.string().optional() }))
+    .query(async ({ ctx, input }) => {
+      const { speciesId, locale } = input;
+      const breeds = await ctx.prisma.breed.findMany({
+        where: { speciesId },
+        include: locale ? { translations: { where: { locale }, take: 1 } } : undefined,
+        orderBy: { name: "asc" },
+      });
+      return breeds.map((b) => ({
+        id: b.id,
+        name: (locale && "translations" in b && (b as { translations: { name: string }[] }).translations[0]?.name)
+          ? (b as { translations: { name: string }[] }).translations[0].name
+          : b.name,
+      }));
    }),
 });