FYI, the debug returns a whole lot of lines similar to:
Warning: ezi18n Dec 08 2004 10:44:49 No translation for file(translation.ts) in context(design/affiliate/commissionlevel): 'Commission level' with comment()
Thanks a lot, Jan. I added your tip to http://ez.no/ez_publish/documentation/development/extensions/translation as this is where I would have expected to find it.