Answer by Mr.Goomer for Fragment TextView Not Changed Back Locale

So after few hours,I figure out what the problem was.

The problem was I extended FragmentActivity:

public class MapsActivity extends **FragmentActivity** implements OnMapReadyCallback {

And I should have declared AppCompatActivity:

public class MapsActivity extends **AppCompatActivity** implements OnMapReadyCallback {

I knew I would spend hours about something like that ..

Thank you anyway !