Norwegian macro language code 'no' not picked up by QTranslator

When choosing Norwegian Bokmål in the macOS preferences as the preferred language (Norwegian Nynorsk being the other alternative), the system QLocale is correctly reported as

QLocale(Norwegian Bokmal, Latin, Norway)

with language nb_NO

However it's common to provide translations for Norwegian using the no_NO language code (our own i18n example does this for example).

As a user I would expect a no_NO translation to be picked up and used, for at least nb_NO, and possibly also nn_NO.

It does not seem like QLocale has any knowledge of/concept of macro languages, which makes it hard for QTranslator to provide any fallback logic for this.

Possibly solutions would be to include the macro language in QLocale::uiLanguages(), or to have an explicit QLocale::macroLanguage() that QTranslator can use when looking for translation files.