BluetoothExt: Cleanup translations

* Fix capitalization
* Unify common strings

Change-Id: I9b02ae50c5b1df23686dfbaa3990f89d0c83beed
(cherry picked from commit 2212c1d33d1c67e93ec883a2849a5d63b1fa5a11)
Merge "BluetoothExt: Cleanup translations" into cm-11.0