[Dragen]

As stated in my previous post, I modified your .py file to add both nob and nno. Merging no/nor and nb/nob will do just fine for most norwegians, as most of us consider bokmål to be the true norwegian language. To be honest, I don't really understand why there's two different ISO entries for norwegian and bokmål, as they're universally considered the same.
If you include new norwegian (nn/nno), it needs to be its own thing as it is a different language.

[rockrider69]

As stated in my previous post, I modified your .py file to add both nob and nno. Merging no/nor and nb/nob will do just fine for most norwegians, as most of us consider bokmål to be the true norwegian language. To be honest, I don't really understand why there's two different ISO entries for norwegian and bokmål, as they're universally considered the same.
If you include new norwegian (nn/nno), it needs to be its own thing as it is a different language.

Sorry I missed your modified langcodes.py proposal while writing my first answer. Thanks for the enlightment anyway 
Creating new lines in this table require a bit more work, as you need to manage script/id renumbering in the table and update strings.po for the labels accordingly. Feasible if really needed.

But as you agree with this, I will add "nob" as alias to "nor" on the current Nowegian line, in next 1.0.5 release.

[rockrider69]

@Dragen
In the end I chose to stick to how ISO639-2 languages codes are declared and created new separated lines for both Norwegian Bokmal and New Norwegian.
Please check this release from Github LPM 1.0.5, and tell me if everything is fine.
I'll then push it to the official Kodi repository.