Yeah, its not that easy for non-native people I would say, for example, If you want to find a Chinese spinner, I would glad to help, its damn a lot, because I come from China, its easy to find in my language, and in English world, its WordAi is the best no doubt, for Germany, I have no idea, you have to find a Germany with a deep knowledge about these things and used the spinner himself, even some spinner say it can spin other language, but its totally different thing, they often first spun English words/sentences, and then translate to another language, its like shit.
But since other people claimed German -- English translate would be way better than other languages, so if you can't find one last, maybe just try a good english spinner like WordAi.