Log Message:
Update to 2.2.4, based on patch from Adrian Portelli in pkg/22629.
Changes since 2.2.4rc1:
[mdj] SECURITY: Add dereferer to strip off session information from links to
      the outside of the Horde system to protect against session hijacking.
[jan] Fix a bug with importing vCard 2.1 data.
[jan] Add Arabic (Syria) translation (Platinum Development Team
      <devteam@platinum-sy.net>).