removed language key variable from learning materials model.
removed language key variable from learning materials model.

Trott/ilios,justinchu17/ilios,dartajax/ilios,ilios/ilios,stopfstedt/ilios,dartajax/ilios,thecoolestguy/ilios,thecoolestguy/ilios,Trott/ilios,ilios/ilios,stopfstedt/ilios,justinchu17/ilios,justinchu17/ilios,justinchu17/ilios