patch for Gedit breaking string freeze

[sf <nud apinc org>]

Hello,

Sorry for bothering you with it, but we noticed lately that some strings 
weren't localized properly in gedit [1]. Actually, most of them were 
bugs, but three were just forgotten (see the second patch on the bug).

So we the gedit team are requesting a permission of committing it.

Note that not doing so wouldn't be a regression since these strings were 
not translated in 2.14 too.

Thank you.

Steve

[1] http://bugzilla.gnome.org/show_bug.cgi?id=351931

PS. I'm not subscribed on gi18n, so please keep me and gedit-list in CC. 
Thanks.