You are missing a line in the language file. Of course you're using a VERY old version of DT Register too... but you can add this anywhere in the frontend language file:
Thanks, got it working (I'm using a Dutch language file, so it took me some time to figure out your suggested line was indeed missing in the NL language file...).
One more question: if you look at
http://nwib.be/index.php/component/opti ... Itemid,14/
you'll see that that's an English sentence (Below is a list of all events that are currently open for registration. Click on the event name to proceed.)
How and where can I change that to Dutch?