Hello,
As far as I checked, we should be using "nb" as the language code of "nowiki". As is known, (see bugs 46455 and 37459), Wikidata allows both codes. I've just come upon a bot request that is over 2 months old that I'm willing to tackle, just that I need verification: terms should use the language code "nb" rather than "no", correct?
As for statistics, there are 534741 uses of the "no" code at present, and only 294725 uses of the "nb" code (at present). As I said, I'm willing to have my bot make the necessary fixes, but I just need to verify i advance.
Thanks.
Hazard-SJ