gedit-plugins: 5 new strings

[Steve Frécinaux <sf istique net>]

Hello, 

I added five new strings into gedit-plugin last days.

I notify you so you're aware of that but strictly speaking this module
is not subject to the freeze. But since we'd like to throw the 2.18
version in the next days I notify you, just in case ;-)

Regards,

Steve