Bluetooth: Update values

- Let strings_map.xml use strings from strings_pbap.xml,
  so translators don't have to translate everything and
  languages with no active translators on CyanogenMod
  have less English strings

- Reduce the use of capital letters

Backport from cm-10.1 branch

Change-Id: I507ff6b6e1f55db8f9a509c027f85c6a56bddb78