text: Title: [BUG] django-cms and django-modeltranslation 0.19.3+
  Body: ## Description
  
  Using these two together causes `allow_children` and `child_classes` to be ignored, and `disable_child_plugins` is always set in the structure editor. And maybe more.
  
  ## Steps to reproduce
  
  Install django-cms 3.11.X, and django-modeltranslation 0.19.3+. Try the structure editor, plugins can be placed within others - only plugins that have a `child_classes = ["APlugin"]` work correctly. Plugins with a parent are all locked, and cnnot be moved outside the parent.
  
  ## Expected behaviour
  
  As before, structure limits respected, no locked plugins.
  
  ## Actual behaviour
  
  I tracked the issue to this template: https://github.com/django-cms/django-cms/blob/3.11.6/cms/templates/cms/toolbar/dragitem.html#L3
  
  Using `{{ plugin.get_plugin_class.allow_children|pprint }}` shows `attribute error: XYPlugin has no attribute admin_site`. Not using pprint outputs the model name, i.e. always `True`. YAY. After looking around which admin could be adding some kind of getter or whatever, I found modeltranslation - 0.19.2 and everything is ok. 0.19.3 adds some typing stuff that I don't really understand, and monkeypatches Djangos ModelAdmin - as far as I get it.
  
  Here it is, probably/maybe around the monkeypatch?!: 
  https://github.com/deschler/django-modeltranslation/compare/v0.19.2...v0.19.3#diff-70244e2051407abc833c4b5691c54704040cb171edc9a46d71260332fe87ec4bR26
  
  I don't know admin internals that well, but it seems that somewhere an admin_site is required? But where and how, no clue yet.
  
  ## Additional information (CMS/Python/Django versions)
  
  Python 3.11, django-cms 3.11.X and django-modeltranslation 0.19.3+ to reproduce.
  
  ## Do you want to help fix this issue?
  
  * [x] Yes, I want to help fix this issue and I will join the channel #pr-reviews on [the Discord Server](https://discord-pr-review-channel.django-cms.org) to confirm with the community that a PR is welcome.
  * [ ] No, I only want to report the issue.
  