Title "subjects" makes object inaccessible

[skillfully]

Plone: 5.2.5
p.a.m: 5.6.3

Steps to reproduce:

• create a vanilla Plone site with activated multilingual support and 2 languages, eg. German and English
• create a folder with title "subjects" in one LanguageRootFolder

The folder "subjects" is created but you can not access or delete it but it is shown in foldercontents etc.
The same issue appears if you are creating a page.

[krissik]

I have seen this error today (Plone 5.2.7). A user created a folder named "subjects" but this folder was not accessible. This was the error message:

Forbidden: The object at https://xyz/en/fb10/xyz/subjects has an empty or missing docstring. Objects must have a docstring to be published.
  File "ZPublisher/BaseRequest.py", line 518, in traverse
    subobject = self.traverseName(object, entry_name)
  File "ZPublisher/BaseRequest.py", line 349, in traverseName
    ob2 = adapter.publishTraverse(self, name)
  File "opt/plone/buildout-cache/eggs/plone.dexterity-2.10.5-py3.7.egg/plone/dexterity/browser/traversal.py", line 52, in publishTraverse
    request, name
  File "ZPublisher/BaseRequest.py", line 148, in publishTraverse
    "published." % URL

NotFound: subjects
  File "ZPublisher/WSGIPublisher.py", line 162, in transaction_pubevents
    yield
  File "ZPublisher/WSGIPublisher.py", line 371, in publish_module
    response = _publish(request, new_mod_info)
  File "ZPublisher/WSGIPublisher.py", line 250, in publish
    obj = request.traverse(path, validated_hook=validate_user)
  File "ZPublisher/BaseRequest.py", line 540, in traverse
    return response.forbiddenError(entry_name)
  File "ZPublisher/HTTPResponse.py", line 1009, in notFoundError
    raise exc

[jensens]

still an issue in Plone 6.0.2 (tested in classicUI)