EDIT: I misread your question I think, nevertheless I may have not ... sorry if I did
Here's my reply anyway... I though you just didn't have those keys responding ...
have a look in /etc/profile.d/lang.sh
there is a line:
turn it into
(I gather from your location that your in the netherlands)
That did it for me (though it was LANG=nl_BE@euro)
Try it out (needs rerunning lang.sh[I THINK] or rebooting[I KNOW])