old_contents: from django.conf import settings
  
  
  class ElectionMixin(object):
      '''A mixin to add election data from the URL to the context'''
  
      def dispatch(self, request, *args, **kwargs):
          self.election = election = self.kwargs['election']
          if election not in settings.ELECTIONS:
              raise Http404(_("Unknown election: '{election}'").format(election=election))
          self.election_data = settings.ELECTIONS[election]
          return super(ElectionMixin, self).dispatch(request, *args, **kwargs)
  
      def get_context_data(self, **kwargs):
          context = super(ElectionMixin, self).get_context_data(**kwargs)
          context['election'] = self.election
          context['election_data'] = self.election_data
          return context
  
new_contents: from django.conf import settings
  from django.http import Http404
  from django.utils.translation import ugettext as _
  
  
  class ElectionMixin(object):
      '''A mixin to add election data from the URL to the context'''
  
      def dispatch(self, request, *args, **kwargs):
          self.election = election = self.kwargs['election']
          if election not in settings.ELECTIONS:
              raise Http404(_("Unknown election: '{election}'").format(election=election))
          self.election_data = settings.ELECTIONS[election]
          return super(ElectionMixin, self).dispatch(request, *args, **kwargs)
  
      def get_context_data(self, **kwargs):
          context = super(ElectionMixin, self).get_context_data(**kwargs)
          context['election'] = self.election
          context['election_data'] = self.election_data
          return context
  
subject: Add some missing imports