🌍 fix: Enhance i18n Support & Optimize Category Handling (#5866)

* fix: Missing Translations in Prompt Filters in Prompt Library

* fix: fixed issue with `zh`
feat: added `Estonian` language option

* fix: test for `i18n.ts`

* refactor: `pt` --> `pt-BR` and `pt-PT`

* feat: request access to another language. default is only one language during invite.

client/src/locales/de/translation.json

@@ -340,7 +340,9 @@
   "com_nav_lang_arabic": "العربية",
   "com_nav_lang_auto": "Automatisch erkennen",
   "com_nav_lang_brazilian_portuguese": "Português Brasileiro",
+  "com_nav_lang_portuguese": "Português",
   "com_nav_lang_chinese": "中文",
+  "com_nav_lang_estonian": "Eesti keel",
   "com_nav_lang_dutch": "Nederlands",
   "com_nav_lang_english": "English",
   "com_nav_lang_finnish": "Suomi",
@@ -357,6 +359,7 @@
   "com_nav_lang_swedish": "Svenska",
   "com_nav_lang_turkish": "Türkçe",
   "com_nav_lang_vietnamese": "Tiếng Việt",
+  "com_nav_lang_traditional_chinese": "繁體中文",
   "com_nav_language": "Sprache",
   "com_nav_latex_parsing": "LaTeX in Nachrichten parsen (kann die Leistung beeinflussen)",
   "com_nav_log_out": "Abmelden",