I have created a working prototype ( https://gist.github.com/ImreSamu/18fd1a419e514642ed4b ) for
I think it is very useful for me and the small hungarian community for detecting translations problems, and errors.
I have created a proposal for a similar service for helping translators: https://github.com/openstreetmap/iD/issues/2448
some new languages examples:
my code not working for Korean and Japan language :(