[#20] Port localization changes from feature/localization2

* Add Spanish translations
* Delete unused strings
Merge branch 'feature/refactor' into feature/refactor_localization
[#20] Add Spanish strings for APK update UI
[#20] Update Spanish strings
[#20] Clean up strings file
Merge branch 'feature/refactor_localization' into feature/refactor
[#20] Make the App Language preference layout consistent

* Add dropdown-like button
* Add Spanish arrays file