as you I am not an eZ guy, but that little piece of something looks quite easy to implement.
Though I have to say beware. Google translation / maschine translation is far far away from you have in mind.
My make myself use of google if I get for example an email in spanish and I let google translate it. So that I have an rough idea on what the customer actually wants.
The only company that I know that really does real good automatic translation is microsoft with their knowledge base artikels. But the truth is they are semi automatic translated since they are run again microsofts huge translation memory build by professional translators.
