I tried to install again Norrnext for a multilanguage site and set up a category for second langauge, first one is english.
But the category mapping for that second language doesnt work it doesnt show up. I have enabled also the multilanguage setting in option backend for Norrnext and tried to make it work but not.
Have you tried a multilanguage with categories? can you double check it for latest version and if there is a bug for that there..
Cheers!