po: Add missing LINGUAS
Remove obsolete application/x-gmc-link mime-type

application/x-gmc-link was added to nautilus from gmc, then to
gnome-mime-data, then to shared-mime-info. It's an internal type
to gmc, and should be re-added there if necessary.

https://bugs.freedesktop.org/show_bug.cgi?id=82172
po: Add missing files
po: Add more languages to LINGUAS