translation not working in wordpress ms

Hi i have a wpmu setup with buddypress. I have the danish translation files

da_DK.po
ms-da_DK.po

and also
buddypress-da_DK.po

The string in specific is "Site name must be at least 4 characters." Which is not shown in danish. I have checked the string actually is in the translation files:

root@vserver:disappointed:var/www/bloggersdelight.dk/web/wp-content/languages# grep -R "Site name must be at least 4 characters" *
Binary file ms-da_DK.mo matches
ms-da_DK.po:msgid "Site name must be at least 4 characters"

So i try to recompile the mo file with this:
root@vserver:disappointed:var/www/bloggersdelight.dk/web/wp-content/languages# msgfmt -o ms-da_DK.mo ms-da_DK.po
root@vserver:disappointed:var/www/bloggersdelight.dk/web/wp-content/languages#

But on the bloggersdelight.dk/register/ i still get this error in english when the sitename is shorter than 4 characters and NOT the danish translation.

I have this defined in my wp-config.php

define('WPLANG', 'da_DK');

I have confirmed with phpinfo() that gettext is enabled.

Any suggestions ?