Bug#658855: gnome-shell: Icedove isn't marked as running Application

[Martin Dosch]

Actually this bug was caused by a mozilla language .xpi as told in a 
former email. Due to this language file Icedove identified as 
Thunderbird and was handled like a new application by gnome-shell. As 
there are the fitting language-packages in the repositories I havn't 
tried this again.

Best regards,
Martin