feat(localization): add Azerbaijani and Russian translations

[iamvaliyev]

Summary

Adds two new locales to stream_chat_localizations:

• Azerbaijani (az) — full translation bundle (StreamChatLocalizationsAz).
• Russian (ru) — full translation bundle (StreamChatLocalizationsRu), with proper Russian pluralization (one/few/many) for all count-based strings (e.g. 1 голос / 2 голоса / 5 голосов, members, replies, results, votes, threads, unread count).

Both locales are registered in GlobalStreamChatLocalizations (part directive, kStreamChatSupportedLanguages, and getStreamChatTranslation). The package README.md (supported languages, supportedLocales usage example, and iOS Info.plist example) and CHANGELOG.md are updated accordingly.

Each language is added in its own self-contained commit.

Test plan

• dart analyze --fatal-infos lib — no issues
• dart format --set-exit-if-changed . — no changes
• flutter test — all tests pass, including the auto-generated translations exist for az and translations exist for ru cases in translations_test.dart
• All StreamChatLocalizations members implemented for both locales (parity with en)

I have signed the Stream CLA.

Summary by CodeRabbit

• New Features
  • Added Azerbaijani (az) and Russian (ru) locales with full UI translations, pluralization, relative date/time formatting, typing indicators, and poll support.
• Bug Fixes / Improvements
  • Expanded localized strings for attachments, moderation, mute/pin toggles, unread/thread labels, and vote/count phrasing.
• Documentation
  • Supported languages, usage examples, and changelog updated to include az and ru.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR adds Azerbaijani (az) and Russian (ru) locales: docs updated, the localization registry wired, and two full translation implementations added (~1,400 lines).

Changes

Localization Language Support

Layer / File(s)	Summary
Documentation and localization registry packages/stream_chat_localizations/CHANGELOG.md, packages/stream_chat_localizations/README.md, packages/stream_chat_localizations/lib/src/stream_chat_localizations.dart	Changelog and README updated to list Azerbaijani and Russian. kStreamChatSupportedLanguages and getStreamChatTranslation were extended and part directives added for the new locales.
Azerbaijani localization implementation packages/stream_chat_localizations/lib/src/stream_chat_localizations_az.dart	Adds StreamChatLocalizationsAz with Azerbaijani translations and helpers: typing text, attachment progress, pin/delete/resend toggles, _getDay/sentAtText, counts, mute/unmute variants, unread labels, poll validation/messages, and vote labels.
Russian localization implementation packages/stream_chat_localizations/lib/src/stream_chat_localizations_ru.dart	Adds StreamChatLocalizationsRu with Russian translations and helpers: _plural pluralization, typing/text plural rules, _getDay/sentAtText using Jiffy, toggle/mute variants, poll validation/messages, and vote/count pluralization.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 Nibbling carrots, I translate with cheer,
az and ru now whisper in chat near.
Strings hop in place from Baku to Rus,
My whiskers twitch—locales updated thus.
🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding Azerbaijani and Russian translations to the localization package.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.52%. Comparing base (e19b1ce) to head (aa9c804).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2727      +/-   ##
==========================================
+ Coverage   65.96%   66.52%   +0.56%     
==========================================
  Files         425      427       +2     
  Lines       26926    27381     +455     
==========================================
+ Hits        17761    18216     +455     
  Misses       9165     9165              

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