code: def errors_as_text(self):
          
          errors = []
          errors.append(self.non_field_errors().as_text())
          errors_data = self.errors.as_data()
          for key, value in errors_data.items():
              field_label = self.fields[key].label
              err_descn = ''.join([force_text(e.message) for e in value])
              error = "%s %s" % (field_label, err_descn)
              errors.append(error)
          return ','.join(errors)
docs: only available to Django 1.7+