Show status message to student when accessing deleted evaluation

Added a status message:
The evaluation has been deleted and is no longer accessible. Please
contact your instructors if you need to submit/edit an evaluation.
Changed status message
Added status messages to feedback sessions

Shows a status message to user when trying to edit a deleted feedback
session
Merge branch 'master' into Issue1936
Merge branch 'master' into Issue1936
[1936] StudentEvalSubmissionEditPageAction: assertion failure

fixes #1936