0.21.0.988 RC

- Switch to your Language pop-up
- Internal localization logic changes
- Disabled Save edited photos to gallery by default
- Settings > Language opens much faster & now available offline.
- Settings > Stickers opens much faster & smoother (no loading spinner, etc)
- Chat Preview, which is used in Settings > Themes and Chats > Wallpaper / Text Size, now is fully customizable through localizations (you can also make your own scenes this way - useful for creating fake news).
- Localization bugfixes

More info on localization changes: @tgx_android_translate

This version is Release Candidate. If no critical issues found, it will be pushed to production.

If you find critical issues, please report to the testing group.