old_contents: from django.conf import settings
  from django.utils.translation import ugettext_lazy as _
  
  USER_SESSION_FLAG = getattr(settings, "LOGINAS_FROM_USER_SESSION_FLAG", "loginas_from_user")
  
  USER_SESSION_DAYS_TIMESTAMP = getattr(settings, "LOGINAS_USER_SESSION_DAYS_TIMESTAMP", 2)
  
  CAN_LOGIN_AS = getattr(settings, "CAN_LOGIN_AS", lambda r, y: r.user.is_superuser)
  
  LOGIN_REDIRECT = getattr(settings, "LOGINAS_REDIRECT_URL", settings.LOGIN_REDIRECT_URL)
  
  MESSAGE_LOGIN_SWITCH = getattr(
      settings,
      "LOGINAS_MESSAGE_LOGIN_SWITCH",
      _("Your login is now switched to {username} - log out to become your original user!")
  )
  
  MESSAGE_LOGIN_REVERT = getattr(
      settings,
      "LOGINAS_MESSAGE_LOGIN_REVERT",
      _("You are now logged back in as {username}")
  )
  
  MESSAGE_EXTRA_TAGS = getattr(settings, 'LOGINAS_MESSAGE_EXTRA_TAGS', '')
  
new_contents: from django.conf import settings
  from django.utils.translation import ugettext_lazy as _
  
  USER_SESSION_FLAG = getattr(settings, "LOGINAS_FROM_USER_SESSION_FLAG", "loginas_from_user")
  
  USER_SESSION_DAYS_TIMESTAMP = getattr(settings, "LOGINAS_USER_SESSION_DAYS_TIMESTAMP", 2)
  
  CAN_LOGIN_AS = getattr(settings, "CAN_LOGIN_AS", lambda r, y: r.user.is_superuser)
  
  LOGIN_REDIRECT = getattr(settings, "LOGINAS_REDIRECT_URL", settings.LOGIN_REDIRECT_URL)
  
  MESSAGE_LOGIN_SWITCH = getattr(
      settings,
      "LOGINAS_MESSAGE_LOGIN_SWITCH",
      _("Your login is now switched to {username} - log out to become your original user!")
  )
  
  MESSAGE_LOGIN_REVERT = getattr(
      settings,
      "LOGINAS_MESSAGE_LOGIN_REVERT",
      _("You are now logged back in as {username}.")
  )
  
  MESSAGE_EXTRA_TAGS = getattr(settings, 'LOGINAS_MESSAGE_EXTRA_TAGS', '')
  
subject: Rename MESSAGE_LOGIN_REVERT to LOGINAS_MESSAGE_LOGIN_REVERT.