Renaming the .desktop files back to their 3.6 versions

[Jeremy Bicha <jbicha ubuntu com>]

I submitted patches for this transition. I think we want this to go in
today before 3.7.92/hard freeze. I apologize for not submitting this
sooner.

https://bugzilla.gnome.org/696066
https://bugzilla.gnome.org/696067
https://bugzilla.gnome.org/696068
https://bugzilla.gnome.org/696069
https://bugzilla.gnome.org/696070
https://bugzilla.gnome.org/696071
https://bugzilla.gnome.org/696072
https://bugzilla.gnome.org/696074
https://bugzilla.gnome.org/696075

Thanks,
Jeremy