Feature : Volume adjust sound preference 2/2

Adjusting the volume makes a nice "boing" sound
Personally I find this annoying
This patch makes this a preference in
Settings | Sound
    Volume adjust sound
        Play sound when adjusting volume with hard keys

The Checkbox is defaulted to ON (1 in defaults.xml)

Look at 1/2 for the Settings, Sound Panel Change
http://review.cyanogenmod.com/14722

Change-Id: I1113d62a5d99a1fe59f3c14362371af24d10b549
Add option to dissable camera shutter sound

PATCH 2: Changed warning message
         Added Spanish translation

based on a4cc836a3f2e6908e2c33b60fec1ecea55eae07a from gb

Change-Id: Ic9b06d3b78e8eab6921ee6192f67134f1b8c88a6