base

Update the title when going back from region selection

Since the title in the region selector should be the language name,
the standard Preference logic is bypassed. So the normal Preference
implementation cannot update the title automatically.
This makes sure we set the title at the right time.

Bug: 26715311
Change-Id: Ifa3d70b8504b093ae17baba8c179ebf55e3c7be2