Without Hacking Solution:

Admin CP/Vb Settings/Format for registration date:
Change it to d-m-Y or m/Y

This will not translate the month names but will show them in numeric format so will apply to every language..

That's how I use.. If it fits to you..

g-force2k2,
non of them helps me

PPN,
i dont need to ask i can find the scripts there /usr/lib/locale and yes there is an ar_KW script but it setlocale() still doesnt work

Logician,
thats a good way thanks but i still want to change it

thanks all