[facet html] Add surrounding div with "facetBody" class to "has_text" facet.
This makes its html structure consistent with the other facets
and fixes both css and a javascript behaviour (hide the facet body
when clicking on its title).
Closes #3797501.
Schema of the data
------------------
First take a look at the data schema_ then try to remember that you are browsing
through a heap of data by applying stylesheets to the results of queries. This
site is not a content management system with items placed in folders. It is an
interface to a database which applies a view to retreived data.
.. _schema: schema