It turns out that Norwegian is not a language family in the linux locale codes like other languages - ie we have the first 2 letters for French variants tell us 'French'

fr_FR
fr_CA

For Norway we have

nb_NO
no_NO
ny_NO

I need to read a bit but it seems they are considered different languages (at least in their written form).

I tried 'fixing up' the Bokmaal translation @TomaszGorski had done as it showed as having saved the English version rather than the Norwegian version when I looked at it.

I have spun this off as a separate task so we don't lose it....