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I just want to add a word of warning here -- using automated translation tools to directly create content for your site could be seen as creating auto-generated content, which would be against our Webmaster Guidelines. Instead of just taking the output of a program like Google Translate, I'd strongly recommend at least having it corrected before putting it online.
As I read that, he's saying that auto-translation left uncorrected may have so many odd language choices that it will trip Google's automated filter that identifies auto-generated text (Markov chain garbage, etc.)
So it's not a duplicate content concern (which is not a penalty) but it's an auto-generated content flag, which really IS a penalty.
Thanks to Search Engine Roundtable [seroundtable.com] for spotting the story.