I don't want Norwegian UI - I just want to be able to record Norwegian sentences. If the UI switches to Norwegian I'd be very annoyed, as I haven't indicated I want that and my browser settings specify English.
(I avoid Norwegian for UIs, because the translations are generally wildly inconsistent in how they translate key terms that I'm used to seeing in English, so it's a massive nuisance - when people assume UI and content language should be the same, that is a major failing to me)
Re: tags someone else pointed out the accent field is being used for this, even though the UI describes that as specifically for accents.