old_contents: from django.apps import AppConfig
  from django.utils.translation import ugettext_lazy as _
  
  
  class CountryDialcodeConfig(AppConfig):
      verbose_name = _('Country Dialcode')
  
new_contents: from django.apps import AppConfig
  from django.utils.translation import ugettext_lazy as _
  
  
  class CountryDialcodeConfig(AppConfig):
      name = 'country_dialcode'
      verbose_name = _('Country Dialcode')
  
subject: fix AppConfig supply name