I don't know about whether Google would know or not, but your human visitors probably will notice! Computerised translators such as Google Translate are great for translating little phrases when you're on holiday, but I don't think they can compete with using an actual human being. Language has so many nuances, which a human can understand, but a machine can't.
Years ago the BBC Radio 1 breakfast show used to do a competition where you had to work out what the original phrase was that had been translated into another language and then translated back into English. They didn't use Google Translate (I don't think it existed then!) but changed the language settings on a mobile phone (If I remember rightly). The difference between the original phrase and the final phrase was usually pretty funny (hence the competition).
If I was you, I wouldn't want people in other countries laughing at my product descriptions because of a stupid machine.