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Do I need to use multilanguage in my URLs? For example:
http://mygermanwebsite.example/product/foo
http://mygermanwebsite.example/produkte/
Does that have any effect on Google searches? For example I'm searching for "produkte", will both versions have the same ranks on Google searches?
It will improve your google rankings a lot. Use URL rewrite technology to make this possible without lot of work.
As far as I know the URIs doesn't really have an effect for the ranking. You could use http://mygermanwebsite.com/9772 instead and it wouldn't matter.