Strings marked for translation in gnome-control-center

[Kjartan Maraas <kmaraas online no>]

There were a string that weren't marked for translation in
gnome-control-center. I've commited patches for them and you will need
to update the translation to get to 100% again.

The rationale for doing this is that this isn't really a string change,
but a chance to make the ui 100% translated and thus worth the extra
effort on the translators that actually care enough to keep their
translation complete.

If this is unacceptable to anyone please holler and I'll revert the fix.

Cheers
Kjartan