🌍 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/en/translation.json

@@ -345,7 +345,9 @@
   "com_nav_lang_arabic": "العربية",
   "com_nav_lang_auto": "Auto detect",
   "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",
@@ -784,5 +786,15 @@
   "com_ui_yes": "Yes",
   "com_ui_zoom": "Zoom",
   "com_user_message": "You",
+  "com_ui_loading": "Loading...",
+  "com_ui_finance": "Finance",
+  "com_ui_idea": "Ideas",
+  "com_ui_misc": "Misc.",
+  "com_ui_roleplay": "Roleplay",
+  "com_ui_shop": "Shopping",
+  "com_ui_teach_or_explain": "Learning",
+  "com_ui_travel": "Travel",
+  "com_ui_write": "Writing",
+  "com_ui_empty_category": "-",
   "com_warning_resubmit_unsupported": "Resubmitting the AI message is not supported for this endpoint."
 }