XWIKI-9231: Display "(empty value)" for empty values on Solr's search page
* Display a translated message for empty value.
* Display a translated pretty name for each search facet.
(cherry picked from commit 3b240f65466974f70c765974608783bad4cec825)
XWIKI-9231: Display "(empty value)" for empty values on Solr's search page
* Split large Velocity macro.
(cherry picked from commit 939eb13b1d51ba9dc6456a2f2d374a355fb8e2f8)