Removing legacy solarized colour themes. Remaining themes now inherit more system default colours.

We recently fixed a bug where the Authentication settings buttons could not be used.

On Android 13 and later, Mumla nowdays supports per-app language setting. Pick language in System settings / Languages / App Languages.

The languages available in Mumla are those which have been translated to 40% or more.
You can help translating Mumla at https://hosted.weblate.org/engage/mumla/
