The guardian has to be fought and defeated, there's nothing else to do with it.
The language on the sign is a mix of English and German, like an Englishman who doesn't really understand German trying to write in German and failing miserably.
The meaning is something like "Beware ! Press button for the exit"
If you press the button you get to a new part of the game (but you'll be able to return to the castle later).
I recommend killing the guardian first since you don't want to have to climb up again.
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