I'm not a German speaker, and neither is most of the potential audience. Americans don't know no furrin languages and German in particular has fallen off the map so far that a lot of high schools don't offer it as an option anymore, at least that's true in California, where the kids are learning Spanish or maybe Chinese.
To an English speaker, the title evokes "Wonderland + dumb." But really, it's dumb because it's dumb. Doesn't pay to overthink this stuff. A title either works immediately on gut instinct or it doesn't.