old_contents: from django import forms
  
  from tower import ugettext_lazy as _
  
  from challenges.models import Submission
  
  
  class EntryForm(forms.ModelForm):
      
      class Meta:
          model = Submission
          fields = (
              'title',
              'brief_description',
              'description',
              'created_by'
          )
  
new_contents: from django import forms
  
  from challenges.models import Submission
  
  
  class EntryForm(forms.ModelForm):
      
      class Meta:
          model = Submission
          fields = (
              'title',
              'brief_description',
              'description',
              'created_by'
          )
  
subject: Clear up an unused import.