3.16 freeze break request for gnome-control-center

[Richard Hughes <hughsient gmail com>]

Regarding https://bugzilla.gnome.org/show_bug.cgi?id=746907

Basically, if you search for "settings" you get an application that
has no description, and the software center lets you remove it. This
is super bad as removing gnome-control-center takes half of gnome with
it...

If you'd rather, I can just backport the AppData file without the new
strings, although then it will only show the "C" version.

The new strings would be:

* "GNOME Control Center"
* "Utilities to configure the GNOME desktop"
* "The control center is GNOME's main interface for configuration of
various aspects of your desktop."

Matthias seemed to think that asking for a freeze break wouldn't be
the end of the world, although I'm easy either way.

Thanks,

Richard.