Feature/#220 language menu (#7070)
- For #220
- Added advanced header + locale settings item in the settings fragment
- For #220
- Added locale selection page with lib state + handling of locale changes
- For #220
- Removed registering for locale changes in the manifest, allow system
to restart activity in that scenario
- For #220
- Added unit tests for locale settings page
- For #220: fixed an outdated unit test
ga-a
Co-authored-by: Severin Rudie Baron-Severin@users.noreply.github.com