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Is there an english-language version? The website is in German for me

There is - click the settings icon on the top-right corner. Then click on Sucheinstellungen, and under Sprache choose English.

Might make sense to make that more easily discoverable for international users, but I guess you're working on it.

Yep, we'll try to push an update in the coming days for a more meaningful interface and result language detection.