Language settings should be integrated (English and Bengali Language)

[hasancse91]

In Settings page, there is an option to set Language. We need to show a pop-up dialog and show a Radio group with these 3 items:

1. English
2. Bengali
   And 2 buttons: Cancel, OK.

If user select English and hit OK button, we have to store this data in our preference and set Locale('en'). In the same way it should work for Bengali. The default Locale is English.