feat: localization

AGENTS.md

@@ -0,0 +1,114 @@
+# AGENTS.md
+
+## Stack
+
+- **Nuxt 4** (SSR, Nitro server) with **Vue 3** + TypeScript
+- **TailwindCSS v4** via `@tailwindcss/vite` Vite plugin (NOT PostCSS)
+- **Vitest** + `@nuxt/test-utils` with Playwright browser mode for testing
+- **Prettier** (formatting). ESLint config exists but is not wired to any npm script.
+
+## Setup
+
+```bash
+cp .example.env .env   # then edit .env
+npm install             # triggers nuxt prepare via postinstall
+```
+
+- **Node ≥ 24** required (`package.json` engines)
+- **Git submodule** at `assets/lib/rule-34-shared-resources` — clone with `--recursive`
+- **External API**: the app calls a separate API service at `NUXT_PUBLIC_API_URL` (default `http://localhost:8081`). The
+  API codebase is at [github.com/Rule-34/API](https://github.com/Rule-34/API).
+
+## Commands
+
+| Command              | What it does                                  |
+|----------------------|-----------------------------------------------|
+| `npm run dev`        | Dev server at `localhost:8080`                |
+| `npm run build`      | Production build into `.output/`              |
+| `npm run generate`   | Static generation                             |
+| `npm test`           | `vitest run`                                  |
+| `npm run test:watch` | `vitest watch`                                |
+| `npm run release`    | `standard-version` for versioning + changelog |
+
+## Architecture
+
+Single Nuxt app. Key directories:
+
+| Dir                  | Purpose                                                                                   |
+|----------------------|-------------------------------------------------------------------------------------------|
+| `config/`            | Centralized project config (`project.ts` for branding/URLs, `i18n.ts` for locales)        |
+| `app/`               | Nuxt app-level config (router options, SPA loading template)                              |
+| `composables/`       | Shared Vue composables (auto-imported by Nuxt)                                            |
+| `plugins/`           | Client plugins loaded in order by numeric prefix (`020.`, `030.`, `035.`, `040.`, `050.`) |
+| `server/api/`        | Nitro server API routes                                                                   |
+| `server/middleware/` | Nitro middleware                                                                          |
+| `server/plugins/`    | Nitro plugins                                                                             |
+| `assets/js/`         | Shared JS utilities, DTOs, custom providers                                               |
+| `assets/lib/`        | Git submodule for shared resources                                                        |
+| `locales/`           | i18n JSON files (en, ru, es, ja)                                                          |
+| `components/`        | Vue components — **auto-imported flat** (`pathPrefix: false`, no folder prefix)           |
+| `test/`              | Page tests, server tests, mocks                                                           |
+
+## Conventions & Gotchas
+
+### Component auto-imports
+
+Components are registered **without path prefix** (`nuxt.config.js` → `components: [{ pathPrefix: false }]`). Import
+them as `<DomainSelector>` not `<Input/DomainSelector>`.
+
+### i18n
+
+- Locales are defined in `config/i18n.ts` (single source of truth).
+- Non-default locales (ru, es, ja) get URL prefixes. Route rules in `nuxt.config` are mirrored via the
+  `mirroredRouteRules()` helper so prefixed paths get the same caching/SSR rules.
+- **Known bug**: `canonicalQueries` in the i18n module config is a no-op in v10. A workaround plugin at
+  `server/plugins/fix-canonical-queries.ts` patches the canonical `<link>` in SSR output.
+
+### Router
+
+- Custom scroll behavior: skips scroll-to-top when only the `page` query param changes between same-route navigations.
+- Legacy redirect: `server/middleware/redirect-to-posts.get.ts` redirects `/?domain=x&page=…&tags=…` →
+  `/posts/x?page=…&tags=…` (301).
+
+### Images
+
+A custom `imgproxy` provider is registered for `<NuxtImg>` (see `nuxt.config.js` → `image.providers`). Images are
+deliberately generated at 1x density only (webp format) to reduce bandwidth.
+
+### PWA
+
+The service worker is intentionally disabled (`selfDestroying: true`). Do not add service worker logic.
+
+### TailwindCSS
+
+Tailwind v4 uses CSS-based config (`assets/css/main.css`), NOT PostCSS. The `tailwind.config.js` remains only for the
+`@headlessui/tailwindcss` plugin.
+
+### Sentry
+
+- Client: configured in `sentry.client.options.ts` (replay, third-party error filter, deny URLs).
+- Server: `sentry.server.config.ts` reads DSN from env vars directly (before Nuxt boots).
+- Source map uploads only happen in production Docker builds (needs `SENTRY_ORG`, `SENTRY_PROJECT`, `SENTRY_AUTH_TOKEN`
+  build args).
+
+### Testing
+
+- Tests use `@nuxt/test-utils` with Playwright inside `describe` blocks that call `await setup({ browser: true })`.
+- Server-side API calls are mocked via a test-only Nitro plugin at `test/server-mocks/plugin.ts`, injected through
+  `nuxt.config.js` → `$test.nitro.plugins`.
+- In test mode, `$test.runtimeConfig.public.apiUrl` is set to `''` so `$fetch(baseURL: '')` routes to the local Nitro
+  test server.
+- Sentry is fully disabled in tests via `$test.sentry.enabled: false` in `nuxt.config.js`.
+- Debug mode: import `debugBrowserOptions` from `test/helper.ts` for headful playback with slowMo.
+
+### Docker production build
+
+- Multi-stage: build stage needs `SENTRY_*` args for source map uploads; production stage copies only `.output/` (no
+  `node_modules` needed — Nitro bundles everything).
+- `NITRO_PRESET` build arg selects the deployment target.
+
+### Prettier
+
+Key settings: 120-char print width, no semicolons, single quotes, trailing commas removed, single attribute per line in
+Vue templates.
+

app.vue

@@ -1,89 +1,26 @@
 <script setup>
-  import { project } from './config/project.ts'
+import {project} from './config/project.ts'
 
-  provideHeadlessUseId(() => useId())
+provideHeadlessUseId(() => useId())
 
-  const route = useRoute()
   const runtimeConfig = useRuntimeConfig()
-
-  const canonicalUrl = computed(() => {
-    const url = 'https://' + project.urls.production.hostname + route.fullPath
-
-    const parsedUrl = new URL(url)
-    const canonicalIgnoredParams = new Set(['page', 'cursor', 'source_booru'])
-
-    // Keep canonical URLs focused on content-defining params only.
-    // Redirect attribution params (utm_* and source_booru) are intentionally removed so
-    // premium-redirect landings don't create duplicate canonicals for the same page.
-    for (const key of [...parsedUrl.searchParams.keys()]) {
-      if (canonicalIgnoredParams.has(key) || key.startsWith('utm_')) {
-        parsedUrl.searchParams.delete(key)
-      }
-    }
-
-    return parsedUrl.href
-  })
+  const { t } = useI18n()
 
   useHead({
-    htmlAttrs: {
-      lang: 'en'
-    },
-
     titleTemplate: (titleChunk) => {
-      return titleChunk ? `${titleChunk} | ${project.name}` : project.seo.title
-    },
-
-    link: [
-      // Favicon
-      {
-        rel: 'icon',
-        href: '/favicon.ico',
-        sizes: '48x48'
-      },
-      {
-        rel: 'icon',
-        href: '/icon.svg',
-        sizes: 'any',
-        type: 'image/svg+xml'
-      },
-      {
-        rel: 'apple-touch-icon',
-        href: '/apple-touch-icon-180x180.png'
-      },
-      // Canonical URL
-      {
-        rel: 'canonical',
-        href: canonicalUrl
-      },
-      // Preconnect to API
-      {
-        rel: 'preconnect',
-        href: runtimeConfig.public.apiUrl
-      }
-    ]
+      return titleChunk ? `${titleChunk} | ${project.name}` : t('seo.title')
+    }
   })
 
-  useSeoMeta({
-    charset: 'utf-8',
-    viewport: 'width=device-width, initial-scale=1',
-
-    description: project.seo.description,
-
-    keywords: project.seo.keywords.join(', '),
-
-    rating: 'adult',
+  // These meta tags will only be added during server-side rendering
+  if (import.meta.server) {
+    //
 
-    colorScheme: 'dark',
-    themeColor: project.branding.colors.background,
-
-    monetization: '$ilp.uphold.com/Hf3zAn3pQ7fD',
-
-    ogImage: {
-      url: '/social.jpg',
-      width: 1200,
-      height: 630
-    }
-  })
+    useSeoMeta({
+      description: computed(() => t('seo.description')),
+      keywords: computed(() => t('seo.keywords'))
+    })
+  }
 </script>
 
 <template>

assets/js/SeoHelper.ts

@@ -1,51 +1,5 @@
-import Tag from '~/assets/js/tag.dto'
 import { lowerCase, startCase } from 'es-toolkit'
 
-export function tagArrayToTitle(tags: Tag[], addWith: boolean = true, addWithout: boolean = true) {
-  if (!tags.length) {
-    return null
-  }
-
-  const cleanedTags: string[] = tags
-    //
-    .map((tag) => tag.name)
-    //
-    .map((tag) => normalizeStringForTitle(tag))
-    // Remove null
-    .filter((tag) => tag != null)
-
-  const tagsThatStartWithNothing = cleanedTags.filter((tag) => !tag.startsWith('-'))
-
-  const tagsThatStartWithMinus = cleanedTags
-    //
-    .filter((tag) => tag.startsWith('-'))
-    .map((tag) => tag.replace('-', ''))
-
-  let title = ''
-
-  if (tagsThatStartWithNothing.length) {
-    if (addWith) {
-      title += 'with '
-    }
-
-    title += tagsThatStartWithNothing.join(', ')
-  }
-
-  if (addWith && addWithout && tagsThatStartWithNothing.length && tagsThatStartWithMinus.length) {
-    title += ', and'
-  }
-
-  if (tagsThatStartWithMinus.length) {
-    if (addWithout) {
-      title += ' without '
-    }
-
-    title += tagsThatStartWithMinus.join(', ')
-  }
-
-  return title
-}
-
 export function normalizeStringForTitle(string: string) {
   if (!string) {
     return null

assets/js/sidebarLinks.ts

@@ -11,16 +11,14 @@ import { project } from '@/config/project'
 
 export const sidebarNavigation = [
   {
-    name: 'Home',
+    nameKey: 'nav.home',
     icon: HomeIcon,
-
     href: '/',
     isExternal: false
   },
   {
-    name: 'Other sites',
+    nameKey: 'nav.otherSites',
     icon: UserGroupIcon,
-
     href: '/other-sites',
     isExternal: false
   },
@@ -30,38 +28,34 @@ export const sidebarNavigation = [
     ? []
     : [
         {
-          name: 'Install App',
+          nameKey: 'nav.installApp',
           icon: ArrowDownTrayIcon,
           href: `https://www.installpwa.com/from/${project.urls.production.hostname}`,
           isExternal: true
         }
       ]),
 
   {
-    name: 'F.A.Q.',
+    nameKey: 'nav.faq',
     icon: QuestionMarkCircleIcon,
-
     href: 'https://rule34.app/frequently-asked-questions',
     isExternal: true
   },
   {
-    name: 'Blog',
+    nameKey: 'nav.blog',
     icon: NewspaperIcon,
-
     href: `${project.urls.production.toString()}blog`,
-    isExternal: false
+    isExternal: true
   },
   {
-    name: 'Legal',
+    nameKey: 'nav.legal',
     icon: BuildingLibraryIcon,
-
     href: '/legal',
     isExternal: false
   },
   {
-    name: 'Settings',
+    nameKey: 'nav.settings',
     icon: Cog6ToothIcon,
-
     href: '/settings',
     isExternal: false
   }

components/PostPageError.vue

@@ -14,6 +14,7 @@
   const props = defineProps<Props>()
 
   const config = useRuntimeConfig()
+  const { t } = useI18n()
 </script>
 
 <template>
@@ -24,11 +25,10 @@
     />
 
     <div v-if="error.status === 429">
-      <h3 class="text-lg leading-10 font-semibold">Too many requests</h3>
+      <h3 class="text-lg leading-10 font-semibold">{{ t('errors.tooManyRequests') }}</h3>
 
       <span class="w-full overflow-x-auto text-pretty">
-        You sent too many requests in a short period of time. Use the button below to continue using the
-        {{ project.name }}
+        {{ t('errors.tooManyRequestsDescription', { name: project.name }) }}
       </span>
 
       <NuxtLink
@@ -37,12 +37,12 @@
         rel="nofollow noopener noreferrer"
         target="_blank"
       >
-        Verify I am not a Bot
+        {{ t('errors.verifyNotBot') }}
       </NuxtLink>
     </div>
 
     <div v-else>
-      <h3 class="text-lg leading-10 font-semibold">Failed to load posts</h3>
+      <h3 class="text-lg leading-10 font-semibold">{{ t('errors.failedToLoadPosts') }}</h3>
 
       <span class="w-full overflow-x-auto text-pretty">
         {{ error.data?.message ?? error.message }}
@@ -55,7 +55,7 @@
       type="button"
       @click="onRetry"
     >
-      Retry
+      {{ t('errors.retry') }}
     </button>
   </div>
 </template>

components/layout/FeedbackButton.vue

@@ -2,6 +2,8 @@
   import { PencilSquareIcon } from '@heroicons/vue/24/outline'
   import { project } from '@/config/project'
 
+  const { t } = useI18n()
+
   function handleClick(event: Event) {
     window.open(`https://feedback.${project.urls.production.hostname}`, '_blank')
   }
@@ -18,7 +20,7 @@
         target="_blank"
         :to="`https://feedback.${project.urls.production.hostname}`"
       >
-        <span class="text-base font-medium"> Feedback </span>
+        <span class="text-base font-medium"> {{ t('common.feedback') }} </span>
 
         <PencilSquareIcon
           class="h-5 w-5"