Removal of mousetweaks docs

[Gerd Kohlberger <lowfi chello at>]

Hi,

for the 3.6 release we plan to remove the help files of mousetweaks. [1] 
These files have been unmaintained for a while and there's already newer 
documentation available in gnome-user-docs.

Could you please remove the docs from the translation list, so people 
won't waste time translating them.

Thanks very much,
Gerd

[1]  https://bugzilla.gnome.org/show_bug.cgi?id=681268