Settings: Call Ring mode what Google calls it, not Silent mode (1 of 2)

Silent mode -> Ring mode cleanup

Change-Id: I4c0c182d59ebeb9e2372a24131506f1a111fe33f

Conflicts:
	res/values/strings.xml
	res/xml/power_menu_settings.xml
	src/com/android/settings/cyanogenmod/PowerMenu.java