Fix balance in loading state to use loading component instead of 0
Fix width of some components in loading state.
Remove property modelDataValid in favor of existing isModelDataValid.
Fix loading items not always properly removed before adding new
transactions.
Fixes#9617
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