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For laughs, I've just clicked on the "translate this page" flag icon on a website, and noticed if you hold the mouse pointer over a block of "translated" text, up pops a little box with the original text and also a link "Suggest a better translation", which offers you the opportunity to correct the translation and send it off to Google.
Nifty idea, but I wonder what they do with the data. I'd guess it's being fed into their AI or whatever, rather than being used to directly improve the translated site. Anyone know anything more?