In the langlinks part of the sidebar nnwiki is named as "norsk (nynorsk)" and nowiki as "norsk (bokmål)". We use "Norsk bokmål" and "Norsk nynorsk" for the langlinks, but note that we do not use capitals in running text unless it is part of a name. I think it is more or less consensus to write the name for nowiki "Norsk (bokmål) Wikipedia", that is one of the error messages would be "The "Tonsåsen" page could not be found in Norsk (bokmål) Wikipedia".