5
Ok, download the lastest dutch language:
http://xoops.opencms.nl/modules/mydownloads/singlefile.php?cid=10&lid=36
Then:
Unzip the file, normally you have THREE maps, languages, modules, install, make shure they match and upload to your XOOPS root. Ofcourse when you have already installed xoops, you can remove the install folder.
After that, go to Administration Menu - System Admin - Settings - General Settings (something like that) - Language. Normally you can select there now nederlands. Goodluck.