XWIKI-9721: Add a hint to the Language search facet to explain why some documents don't have a language set
* Apply the new XAR XML format.
XWIKI-9721: Add a hint to the Language search facet to explain why some documents don't have a language set
[misc] Display the language pretty name in the advanced search options.
[misc] Improve a bit the label for the result type and attachment media type advanced search filters.