Reword Studio warning message

apps/openassessment/xblock/submission_mixin.py

@@ -30,7 +30,7 @@ class SubmissionMixin(object):
         'EBADFORM': _(u'API Submission Request Error.'),
         'EUNKNOWN': _(u'API returned unclassified exception.'),
         'ENOMULTI': _(u'Multiple submissions are not allowed.'),
-        'ENOPREVIEW': _(u'You cannot make a submission while in Preview mode.'),
+        'ENOPREVIEW': _(u'To submit a response, view this component in Preview or Live mode.'),
     }
 
     @XBlock.json_handler

apps/openassessment/xblock/test/test_submission.py

@@ -53,4 +53,4 @@ class SubmissionTest(XBlockHandlerTestCase):
         resp = self.request(xblock, 'submit', self.SUBMISSION, response_format='json')
         self.assertFalse(resp[0])
         self.assertEqual(resp[1], "ENOPREVIEW")
-        self.assertEqual(resp[2], "You cannot make a submission while in Preview mode.")
\ No newline at end of file
+        self.assertEqual(resp[2], "To submit a response, view this component in Preview or Live mode.")
\ No newline at end of file