gnome-control-center - new strings marked as translatable

[Michael Wood <michael g wood intel com>]

Hey,

Just to notify you - I've marked some new strings as translatable in 
gnome-control-center sharing panel.

https://git.gnome.org/browse/gnome-control-center/commit/?id=81b7c01e29e09a50bc0b8d81a0687accc165d2a0

This is pushed to the gnome-3-8 branch as well so it'd be good if we 
could get translations in there too.

Many thanks,

Michael