Norwegian has two written variants: Bokmål and Nynorsk. Bokmål is the more commonly used form and most Norwegian speakers understand it.
At OneSky, all Norwegian translations are in Bokmål form.
You will notice that for different type of projects, either Norwegian or Norwegian Bokmål is listed as an available language; this is because OneSky languages are aligned with the supported languages in the corresponding type of app projects. For example, officially iOS only supports Norwegian Bokmål and iTunes Matadata supports only Norwegian, the difference is just in the wording as they both actually mean Bokmål variant.