अनुबाद - अंग्रेजी-हिन्दि - Language-taught

Means "the language you want to teach with this lesson".

सिखाई गई भाषा
(as in Language that was taught)
or

सिखाई जाने वाली भाषा
(as in Language that will be taught)
hmm.. this is like playing a flash game where levels keep increasing. :)