Add Native Language Translation to Context Example in Review Exercises

Originally posted in Canny by Minna Moffatt-Feldman.

Currently we have a context example to help us work out the meaning of words which is great. When we check the answer we have the translation of the word, but not the whole example sentence - this would be REALLY useful to my learning - i hope others too? I use web and android app - it would help on BOTH!