docs: def grading_status_text(self):
          '''
          A rendering of the grading that is an answer on the question
          "Is grading finished?".
          Used in duplicate view and submission list on the teacher backend.
          '''
          if self.assignment.is_graded():
              if self.is_grading_finished():
                  return str('Yes ({0})'.format(self.grading))
              else:
                  return str('No')
          else:
              return str('Not graded')