Added Date & Time selectors in `Language & Currency" screen.
Added new properties in `local_app_settings` to set the date and time format.
Created all the chain from view to service to update date and time format.
Added date and time format functions in `Utils`.
Updated `FetchMoreMessagesButton`, `ChatTimePanel`, `AppSearch`, `TransactionBubbleView` and `TransactionDelegate` date and time text depending on the selected format.
Closes#5386
Renamed setting section "Language" to "Language & Currency".
Updated link to StatusQ - Needed new `StatusListPicker` component.
Added language model in `LanguageStore` and created first view approach for `Language` setting.
Added temporal confirmation dialog for Linux OS (since it is currently needed to restart the app to apply changes).
Removed no longer used files.
Closes#5384
Boris Melnik
Noelia
Sale Djenic