Adding support for ICE track changes to calibration UI improvements

common/lib/xmodule/xmodule/js/src/peergrading/peer_grading_problem.coffee

@@ -459,9 +459,13 @@ class @PeerGradingProblem
       @grading_panel.find(@grading_text_sel).hide()
       @flag_student_container.hide()
       @answer_unknown_container.hide()
-
-      @feedback_area.val("Once you are done with training and are grading real student essays, you will be asked to share feedback with them in addition to grading their rubric.")
       @feedback_area.attr('disabled', true)
+      feedback_text = "Once you are done with training and are grading real student essays, you will be asked to share feedback with them in addition to grading their rubric."
+      if @tracking_changes()
+        @feedback_area.attr('contenteditable', false)
+        @feedback_area.text(feedback_text)
+      else
+        @feedback_area.val(feedback_text)
       @submit_button.show()
       @submit_button.unbind('click')
       @submit_button.click @submit_calibration_essay