old_contents: from karenina import modules
  
  
  class Admin(modules.InstallableModule):
      icon = "mdi-action-settings-applications"
      order = 1000
  
      @property
      def label(self):
          return 'Administration'
  
      def has_perm(self, user):
          return user.is_staff
new_contents: from karenina import modules
  
  
  class Admin(modules.Module):
      icon = "mdi-action-settings-applications"
      order = 1000
  
      @property
      def label(self):
          return 'Administration'
  
      def has_perm(self, user):
          return user.is_staff
subject: Add module declaration for karenina