Add support for localeInfo preference

Read the localeInfo from preferences on startup and subscribe to
system service localeInfo changes. Implements GF-3067, GF-1581.

Open-webOS-DCO-1.0-Signed-off-by: Teppo Pennanen <teppo.pennanen@palm.com>

Change-Id: I562237d2ebaf8e0d21a0ca192834565b99473268