[ticket/13808] search_body_form_before

Extensions may be designed to add secondary search options,
such as Google search in the search_body.html.
There are no events in the searchbody, so this should be merged.

PHPBB3-13808

phpBB/styles/prosilver/template/search_body.html

@@ -2,6 +2,7 @@
 
 <h2 class="solo">{L_SEARCH}</h2>
 
+<!-- EVENT search_body_form_before -->
 <form method="get" action="{S_SEARCH_ACTION}" data-focus="keywords">
 
 <div class="panel">