Norwegian locale: Translates missing 2FA strings (#2655)

* Adds missing strings to Norwegian locale

* Translates missing strings.

* Changes "tofaktorautentisering" to "to-faktor autentisering"

According to the Norwegian National Security Authority this is the correct way to spell it.
https://www.nsm.stat.no/blogg/veiledning-i-to-faktor-autentisering/