Log Message:
py-django-cms: updated to 3.5.2

3.5.2:
* Fixed a bug where shortcuts menu entry would stop working after toolbar reload
* Fixed a race condition in frontend code that could lead to sideframe being
  opened with blank page
* Fixed a bug where the direct children of the homepage would get a leading ``/``
  character when the homepage was moved or published.
* Fixed a bug where non-staff user would be able to open empty structure board
* Fixed a bug where a static file from Django admin was referenced that no
  longer existed in Django 1.9 and up.
* Fixed a bug where the migration 0018 would fail under certain databases.