Add the possibility to configure the search of documents in default language when a document has no translation in the displayed language

Search for documents in default language when a document has no translation in the displayed language.

Now the results are dependent of the current interface language.

In a multilingual wiki if a page has no translation in one of the languages and the displayed language not the document's language no results will be displayed.

A workaround is presented in XWIKI-9977 . So to make search display result when a document has no translation in the displayed language some changes have to be made:

• In <server>/xwiki/bin/edit/Main/SolrSearchMacros uncomment the lines as described in XWIKI-9977
• In <server>/xwiki/bin/edit/Main/SolrSearchConfig change, for the current language not to be selected in Search page

    'locale': ["$xcontext.locale", '']  

  to

   'locales': ["$xcontext.locale", ''] 

• In <server>/xwiki/bin/edit/XWiki/SuggestSolrMacros comment the lines to display results in search suggest:

    #if (!$filterNames.contains('locales'))
      #set ($discard = $filterQuery.add("locale:(""$xcontext.locale"" OR """")"))
    #end 

Add the possibility to configure it from administration.