Add APIs for auto-translate

Auto-translate feature works very good on web.

To implement it in Android, we need API for it for consistency.

  • To check if auto-translate is enabled for a room or not
  • If auto-translate is for a room, which language is selected by user for that room
  • To toggle auto-update preference of room
  • To update language of auto-translate for particular room
  • To get translations of message