Samsung Keyboard not compatible

[Kristober]

Samsung Keyboard doesn't support a custom spell checker so one must use another keyboard such as Gboard.
This is stated in the readme but not indicated in the application itself.
Ideally we need something to identify if a keyboard supports the spellchecker instead of what we do currently, which is:
Redirect users to LanguageSettings, which is fine if users use a compatible keyboard but leaves users with no resolution if the keyboard isnt compatible.

Solution I propose.
Identifying if the keyboard doesen't support a spell checker and instead ask the user if he want's to install Gboard to be able to use the spell checker. If the user has a keyboard installed that is compatible with a spell checker, redirect the user to those settings.