Thunderbird Change Time display from 12 hr to 24 hr

http://lildude.co.uk/howto-customise-thunderbird-date-format

Using the script from above I found what I wanted
YYYY-MM-DD
%H:%M:%S

===
de_AT
d_fmt="%Y-%m-%d"
t_fmt="%T"
===
start thunderbird like so

$ LC_TIME=de_AT thunderbird

If you use LC_ALL=de_AT Thunderbird will use german completely, not just for time/date

Now how can I easily launch Thunderbird from Gnome 3 on Fedora 18 easily?

EDIT: Make a script and add it with alacarte:
http://blog.randell.ph/2011/08/01/how-to-create-custom-application-launc...