[web] Slight tweak on jQueryUI's colors on links (related to #4564046)
Follow up to commit 16f550b48d57 which was somewhat brutal. This change
only overrides jQueryUI's CSS rules inside tab panes and leaves actual
tab buttons alone.
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.