feat: add Farsi (fa) locale support

Add comprehensive Farsi translation for the webmail interface:
- Create locales/fa/common.json with Farsi translations
- Register 'fa' locale in i18n/routing.ts and i18n/request.ts
- Add Iran flag component (FlagIR) to flag-icons.tsx
- Add ف��رسی to language switcher dropdown
- Add Farsi language name to English locale for language selector

Translation covers login, sidebar, email viewer, composer, settings,
notifications, calendar, contacts, errors, shortcuts, and more.

components/ui/flag-icons.tsx

@@ -233,6 +233,18 @@ export function FlagRO(props: FlagProps) {
   );
 }
 
+/** Iran – Green, White, Red horizontal with emblem (simplified) */
+export function FlagIR(props: FlagProps) {
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 4 3" width={W} height={H} className={flagClass} {...props}>
+      <rect width="4" height="1" fill="#239F40" />
+      <rect y="1" width="4" height="1" fill="#fff" />
+      <rect y="2" width="4" height="1" fill="#DA0000" />
+      <circle cx="2" cy="1.5" r="0.3" fill="#DA0000" />
+    </svg>
+  );
+}
+
 /** Map locale codes to flag components */
 export const flagComponents: Record<string, (props: FlagProps) => ReactElement> = {
   cs: FlagCS,
@@ -254,4 +266,5 @@ export const flagComponents: Record<string, (props: FlagProps) => ReactElement>
   tr: FlagTR,
   uk: FlagUA,
   zh: FlagCN,
+  fa: FlagIR,
 };

components/ui/language-switcher.tsx

@@ -12,6 +12,7 @@ const languages = [
   { value: 'da', label: 'Dansk' },
   { value: 'de', label: 'Deutsch' },
   { value: 'en', label: 'English' },
+  { value: 'fa', label: 'فارسی' },
   { value: 'es', label: 'Español' },
   { value: 'fr', label: 'Français' },
   { value: 'it', label: 'Italiano' },

i18n/request.ts

@@ -23,6 +23,9 @@ export default getRequestConfig(async ({ requestLocale }) => {
     case 'es':
       messages = (await import('../locales/es/common.json')).default;
       break;
+    case 'fa':
+      messages = (await import('../locales/fa/common.json')).default;
+      break;
     case 'fr':
       messages = (await import('../locales/fr/common.json')).default;
       break;

i18n/routing.ts

@@ -12,7 +12,7 @@ const localePrefix = (process.env.NEXT_PUBLIC_LOCALE_PREFIX ?? 'never') as
   | 'always'
   | 'as-needed';
 
-const SUPPORTED_LOCALES = ['cs', 'da', 'de', 'en', 'es', 'fr', 'hu', 'it', 'ja', 'ko', 'lv', 'nl', 'pl', 'pt', 'ro', 'ru', 'tr', 'uk', 'zh'] as const;
+const SUPPORTED_LOCALES = ['cs', 'da', 'de', 'en', 'es', 'fa', 'fr', 'hu', 'it', 'ja', 'ko', 'lv', 'nl', 'pl', 'pt', 'ro', 'ru', 'tr', 'uk', 'zh'] as const;
 
 // Fallback locale used when the visitor's Accept-Language header does not
 // match any supported locale (and no NEXT_LOCALE cookie is set yet). Admins

locales/en/common.json

@@ -804,7 +804,10 @@
     "pt": "Português",
     "ru": "Русский",
     "uk": "Українська",
-    "zh": "简体中文"
+    "zh": "简体中文",
+    "fa": "فارسی",
+    "farsi": "فارسی",
+    "switch_to_farsi": "Switch to Farsi"
   },
   "settings": {
     "title": "Settings",