Read cities names for DB and not from list

Bug: 7413861

The list of user selected cities in world clock was using the name from the usr's list and
not from the DB. When a change of locale is done on the device, the cities name were not changed.
Changed the WorldClock adapter to use the DB name and timezone if available.
Added suport in both app and widget.

Change-Id: I029581f9fd6cf245ac980c1d1352e0d777924ccd