Hey there and thank you for asking!
So long as the terms of service for the generator is that it can be used for a commercial game, then you're fine. Just be sure to credit it in your project! :D
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I would say that it's best to err on the side of caution.
First, I'd translate the page (since I can't read any laungage other than English).
Then, if possible, I'd find what I needed or a way to contact the creator.
If that didn't work, if there was absolutely no way no matter my efforts, I would err on the side of caution and not use it.