[Mailman-i18n] Dutch translation update for 2.1.5

[Luc Stroobant]

Hi,

I've been correcting and updating the Dutch translation. We are working 
on MM 2.1.5 from Debian. I thought it might be usefull to send the files 
to this list too.
They can be downloaded on http://pub.telenet.be/~luc/mailman/

Also sent to Debian as bug 306748
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=306748

Maybe parts of this translation can be used for the new release?

Luc