It is possible to imagine a game or an app which display an image and its description in several languages and ask to have it translated or reviewed in a language defined by the user.
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I did something like this back in 2007. My bot copied thumb descriptions from different Wikipedias into Commons.[1] That way you have a lot of work done, though having a review method is better.
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This is now a feature of the Wikimedia Android App as part of the Suggested Edits feature set.