Add option to dissable camera shutter sound

PATCH 2: Changed warning message
         Added Spanish translation

based on a4cc836a3f2e6908e2c33b60fec1ecea55eae07a from gb

Change-Id: Ic9b06d3b78e8eab6921ee6192f67134f1b8c88a6

Conflicts:
	src/com/android/settings/SoundSettings.java