0.20.11.979 beta

- Restart no longer needed when changing language (if after changing language some string is still in previous language, and after restart it's OK, report to the testing group)
- Language section is now always visible, no need to unlock in debug menu.
- Proxy setup button on log-in screen
- Latest libtgvoip version
- Updated TDLib: battery usage improvements while app is in background & internal changes
- Changed black text color in light theme
- Arrow color in "Unread Messages" now matches text color
- Slightly reduced line height in message texts
- Map Provider settings
- Lang: improvements to lang pack and UI for better translations
- Fixed: Crash in sectioned contacts screen
- Fixed: Notification setting hint is lowercased in a wrong place