feat(i18n): add Ukrainian language support (#10696)

## Summary
  - Add comprehensive Ukrainian language support to ZITADEL
  - Complete translation of all user-facing interfaces
  - Integration with existing language configuration system

  ## Changes Made
- ✅ **Console translations**: Complete Ukrainian translation for admin
console (2,861 translated strings)
- ✅ **Login interface**: Ukrainian translations for authentication flows
(535 strings)
- ✅ **Email notifications**: Ukrainian translations for system emails
(68 strings)
- ✅ **Common texts**: Ukrainian translations for success/error messages
(1,417 strings)
- ✅ **Language configuration**: Added Ukrainian to supported languages
and Angular locale registration
- ✅ **UI integration**: Added Ukrainian option to language selection
forms

  ## Translation Quality
  - Professional translations using established Ukrainian IT terminology
  - Formal language appropriate for business software
- Consistent terminology across all components (Users→Користувачі,
Organization→Організація, etc.)
  - Preserved all technical placeholders, HTML tags, and formatting

  ## Contributing Guidelines Compliance
  - ✅ Followed semantic commit message format
  - ✅ Added Ukrainian to all required configuration files
  - ✅ Maintained consistent file structure with existing languages
  - ✅ Used formal Ukrainian appropriate for business software

The Ukrainian translation is now ready for review by the ZITADEL team! 🚀

---------

Co-authored-by: Marco A. <[email protected]>

docs/docs/guides/manage/customize/texts.md

@@ -54,6 +54,7 @@ ZITADEL is available in the following languages
 - 한국어 (ko)
 - Romanian (ro)
 - Turkish (tr)
+- Ukrainian (uk)
 
 A language is displayed based on your agent's language header.
 If a users language header doesn't match any of the supported or [restricted](#restrict-languages) languages, the instances default language will be used.