[ticket/12478] Re-add contact field events in ucp_pm_viewmessage.html.

PHPBB3-12478
[ticket/12478] Add contact field events to viewtopic_body.html.

PHPBB3-12478
Merge pull request #2385 from prototech/ticket/12478

Add contact field before/after events.
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12478] Add contact field events to viewtopic_body.html.
  [ticket/12478] Re-add contact field events in ucp_pm_viewmessage.html.