Alarm: Show a warning toast when alarm volume is set to silent

Change-Id: I97edae55351101046def5058a2459ab88edf2d0d
Automatic translation import

Change-Id: I58e091d8ce0d27720f3eac6c96557ed7e0fcc8e3
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_packages_apps_DeskClock into kitkat