Tag languages of the reviews

It would be great if we can tag the reviews and add a language tag to them, which we can then use in the filter to only display reviews in a certain language. I want to use the widgets on a number of travel-related sites, which have reviews in various languages. It would be great if we could tag them, and have the widget only display reviews in a specific language. This is something that Endorsal does, as I had mentioned it to them previously.