feat(i18n): migrate all hardcoded Russian text to i18n

- Replace all hardcoded Russian strings with t() calls across 30+ files
- Add ~500 new translation keys to all 4 locales (ru, en, zh, fa)
- Convert module-level config objects to labelKey pattern
- Remove Russian fallbacks from t() calls (fallbackLng handles it)
- Replace DeepLinkRedirect custom i18n with standard t() calls
- Fix subscription.servers key collision (string vs object)

src/pages/Polls.tsx

@@ -222,7 +222,8 @@ export default function Polls() {
                   )}
                   <div className="mt-2 flex items-center gap-4 text-sm text-dark-400">
                     <span>
-                      {poll.answered_questions}/{poll.total_questions} {t('polls.questions')}
+                      {poll.answered_questions}/
+                      {t('polls.questions', { count: poll.total_questions })}
                     </span>
                   </div>
                 </div>