Add a language-switch system with per-language files

Introduce a hand-rolled i18n layer across all three UIs, each reading its
text from per-language JSON files (English base + Polish + Danish). Nothing
in the converted screens hardcodes English any more.

- Web App (Vue): src/i18n/{en,pl,da}.json + index.js exposing t()/tSplit(),
  reactive to the signed-in profile locale. Every view, component, form and
  the status labels in lib/format.js go through t().
- API Server panel (Vue): src/i18n/ with its own localStorage-persisted
  language (the panel has no user profile) and a header language picker.
  Chrome, cards, login and API section titles translated; endpoint reference
  descriptions intentionally kept in English. Rebuilt embedded dist.
- Phone App (Flutter): assets/i18n/ + lib/i18n.dart loaded at startup,
  driven by AppSettings.locale. Nav, login, lock, dashboard, the full
  Settings panel (incl. language picker) and format.dart status labels
  translated; remaining detail screens fall back to English.

Language = the language half of the existing BCP-47 locale; the region half
still drives date/number/currency formatting. Missing keys fall back to
English, and plurals use Intl.PluralRules / Intl.plural so Polish gets the
correct one/few/many forms. Settings flags languages without a translation.

Tests updated to assert the localized (Polish) status wording; all pass.
See TRANSLATIONS.md for the format and how to add a language.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

API Server/panel/src/components/OrgsCard.vue

@@ -1,6 +1,7 @@
 <script setup>
 import { ref, onMounted } from "vue";
 import { isSuperadmin, request } from "../api";
+import { t } from "../i18n";
 
 // Listing is manager-scoped (an admin sees only their own org); creating,
 // renaming and deleting are superadmin-only, matching the server's gates.
@@ -58,7 +59,7 @@ async function save() {
 }
 
 async function remove(o) {
-  if (!confirm(`Delete the organization "${o.name}"?`)) return;
+  if (!confirm(t("orgs.confirmDelete", { name: o.name }))) return;
   busy.value = true;
   error.value = "";
   try {
@@ -77,34 +78,34 @@ async function remove(o) {
   <div class="dh-card overflow-hidden">
     <div class="flex items-center justify-between border-b border-subtle px-5 py-4">
       <div>
-        <div class="text-base font-bold tracking-[-0.02em] text-strong">Organizations</div>
-        <p class="mt-0.5 text-xs text-muted">Tenants users belong to</p>
+        <div class="text-base font-bold tracking-[-0.02em] text-strong">{{ t("orgs.title") }}</div>
+        <p class="mt-0.5 text-xs text-muted">{{ t("orgs.subtitle") }}</p>
       </div>
-      <button v-if="isSuperadmin" class="dh-btn" @click="startNew">New organization</button>
+      <button v-if="isSuperadmin" class="dh-btn" @click="startNew">{{ t("orgs.newOrg") }}</button>
     </div>
 
     <p v-if="error" class="border-b border-subtle px-5 py-3 text-xs text-danger">{{ error }}</p>
 
     <div v-if="editing" class="border-b border-subtle bg-sunken px-5 py-4">
-      <label class="dh-label">Name</label>
-      <input v-model="draftName" class="dh-input" placeholder="Acme Fleet" @keyup.enter="save" />
+      <label class="dh-label">{{ t("common.name") }}</label>
+      <input v-model="draftName" class="dh-input" :placeholder="t('orgs.namePlaceholder')" @keyup.enter="save" />
       <div class="mt-3 flex items-center gap-2">
         <button class="dh-btn" :disabled="busy || !draftName.trim()" @click="save">
-          {{ editing === "new" ? "Create" : "Save" }}
+          {{ editing === "new" ? t("common.create") : t("common.save") }}
         </button>
-        <button class="dh-btn-ghost" :disabled="busy" @click="cancel">Cancel</button>
+        <button class="dh-btn-ghost" :disabled="busy" @click="cancel">{{ t("common.cancel") }}</button>
       </div>
     </div>
 
     <p v-if="!orgs.length" class="px-5 py-6 text-center text-sm text-muted">
-      No organizations yet.
+      {{ t("orgs.empty") }}
     </p>
 
     <table v-else class="w-full text-left text-sm">
       <thead>
         <tr class="[&>th]:eyebrow [&>th]:px-5 [&>th]:py-2.5 [&>th]:font-medium">
-          <th>Name</th>
-          <th>ID</th>
+          <th>{{ t("common.name") }}</th>
+          <th>{{ t("orgs.colId") }}</th>
           <th></th>
         </tr>
       </thead>
@@ -114,9 +115,9 @@ async function remove(o) {
           <td class="data px-5 py-2.5 text-xs text-muted">{{ o.id }}</td>
           <td class="px-5 py-2.5 text-right whitespace-nowrap">
             <template v-if="isSuperadmin">
-              <button class="dh-btn-ghost" @click="startEdit(o)">Rename</button>
+              <button class="dh-btn-ghost" @click="startEdit(o)">{{ t("common.rename") }}</button>
               <button class="dh-btn-danger ml-1.5" :disabled="busy" @click="remove(o)">
-                Delete
+                {{ t("common.delete") }}
               </button>
             </template>
           </td>