old_contents: from django.utils.translation import ugettext_lazy as _
  
  from bluebottle.fsm.effects import Effect
  from bluebottle.follow.models import follow, unfollow
  
  
  class FollowActivityEffect(Effect):
      "Follow the activity"
  
      post_save = True
  
      def execute(self, **kwargs):
          follow(self.instance.user, self.instance.activity)
  
      def __repr__(self):
          return '<Effect: Follow {} by {}>'.format(self.instance.activity, self.instance.user)
  
      def __unicode__(self):
          return _('Follow %s by %s') % (self.istance.activity, self.instance.user)
  
  
  class UnFollowActivityEffect(Effect):
      "Unfollow the activity"
  
      post_save = True
  
      def execute(self, **kwargs):
          unfollow(self.instance.user, self.instance.activity)
  
      def __repr__(self):
          return '<Effect: Unfollow {} by {}>'.format(self.instance.activity, self.instance.user)
  
      def __unicode__(self):
          return _('Unfollow %s by %s') % (self.istance.activity, self.instance.user)
  
new_contents: from django.utils.translation import ugettext_lazy as _
  
  from bluebottle.fsm.effects import Effect
  from bluebottle.follow.models import follow, unfollow
  
  
  class FollowActivityEffect(Effect):
      "Follow the activity"
  
      post_save = True
  
      def execute(self, **kwargs):
          follow(self.instance.user, self.instance.activity)
  
      def __repr__(self):
          return '<Effect: Follow {} by {}>'.format(self.instance.activity, self.instance.user)
  
      def __unicode__(self):
          return _('Follow %s by %s') % (self.instance.activity, self.instance.user)
  
  
  class UnFollowActivityEffect(Effect):
      "Unfollow the activity"
  
      post_save = True
  
      def execute(self, **kwargs):
          unfollow(self.instance.user, self.instance.activity)
  
      def __repr__(self):
          return '<Effect: Unfollow {} by {}>'.format(self.instance.activity, self.instance.user)
  
      def __unicode__(self):
          return _('Unfollow %s by %s') % (self.instance.activity, self.instance.user)
  
subject: Fix typo