added test for un-deletable learner group and corrected deletion confirmation test.
added test for un-deletable learner group and corrected deletion confirmation test.

gboushey/frontend,thecoolestguy/frontend,jrjohnson/frontend,gabycampagna/frontend,dartajax/frontend,gabycampagna/frontend,djvoa12/frontend,gboushey/frontend,jrjohnson/frontend,dartajax/frontend,ilios/frontend,ilios/frontend,thecoolestguy/frontend,djvoa12/frontend