The only feature that requires an active internet connection is the ingame map.
Current Languages - English, German, Japanese, Korean, Turkish, Portuguese, Russian, Spanish, Thai, French, Chinese Used language can be changed within the app.
Notifications are not working? Try to disable battery optimizations for the app! General steps are: Settings > Apps > Special Access > Battery Optimizations > All Apps (Dropdown) > Untick the App.
Improvements and more tools are in the works, so don't miss the updates!