server/source/native: fix wrong usage of .lstrip that produce garbled error messages (closes #2777641)
Fixed an .rstrip(...) for the general case (untested).
Fixed an .lstrip(...) for the sqlite path (tested).
Add some entities
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As manager, you can access to entity creation forms by using the `site management`_ page.
.. _`site management`: manage
As regular user, the index page or the action box may propose some links to create entities according to the context.