new_contents: from django import forms
  from django.utils.translation import ugettext_lazy as _
  
  from . import models
  
  
  class GameControlAdminForm(forms.ModelForm):
      """
      Form for the GameControl object, designed to be used in GameControlAdmin.
      """
  
      class Meta:
          model = models.GameControl
          fields = '__all__'
          help_texts = {
              'tick_duration': _('Duration of one tick in seconds'),
              'valid_ticks': _('Number of ticks a flag is valid for')
          }
  
subject: Add missing file, which actually belongs to last commit