Correct the locale code for Norwegian Bokmål.

Norway has two written languages (nn and nb), so one would assume that
the locale is no (Norway) with a modifier to specify which written
language.

Unfortunately, this is incorrect. The written languages have two
separate origins, so they each have a locale code, and the modifier is
the country.

This is in contrast to English, which is considered a single language
with regional modifiers (UK, AU, US, etc).