settings: enable/disable lockscreenwidgets preferences

it is just nicer if the user can see which preferences are active
or not

Change-Id: Ia5f8c3884c747c0f17c50075842e861ab4de1020
hu: small translation cleanup to avoid aapt warning

Change-Id: Ib4480bc2669aa51fc834979b9e211e08a6d2d543