old_contents: from django.apps import AppConfig
  from django.utils.translation import gettext_lazy as _
  
  
  class SimpleTranslationAppConfig(AppConfig):
      name = "wagtail.contrib.simple_translation"
      label = "simple_translation"
      verbose_name = _("Wagtail simple translation")
  
new_contents: from django.apps import AppConfig
  from django.utils.translation import gettext_lazy as _
  
  
  class SimpleTranslationAppConfig(AppConfig):
      name = "wagtail.contrib.simple_translation"
      label = "simple_translation"
      verbose_name = _("Wagtail simple translation")
      default_auto_field = 'django.db.models.AutoField'
  
subject: Set default_auto_field on simple_translation app config