[ticket/12014] Template Event index_body.html before forumlist

Add content above the forums list (on forum index only)

PHPBB3-12014
[ticket/12014] Fix version number in event docs

PHPBB3-12014
[ticket/12014] Change event date in docs

PHPBB3-12014
Merge remote-tracking branch 'vsephpbb/ticket/12014' into develop

* vsephpbb/ticket/12014:
  [ticket/12014] Change event date in docs
  [ticket/12014] Fix version number in event docs
  [ticket/12014] Template Event index_body.html before forumlist