Duolingo says Norsken and Engelsken instead of Norsken/Engelsk

So I've been using Duolingo for about 4 months now and messaging my Norwegian relative. I'm not understanding why Duolingo (I know it's not perfect but it's giving me an intro into that language for now) is adding the suffix -en for spoken languages. I thought "Du snakker Norsk" was correct, not "Du snakker norsken.". Or in the screenshot, why isn't "Tysk hennes..." correct?

Takk!