14.3 Release social media communication

Present new features and changes to OP Team

14.3 Release announcement on website (1-2 weeks in advance)

Create 14.3 release image for blog post and newsletter, incl. feature image

Update Roadmap on website for 14.3

Update Glossary with new terms for 14.3

Update OpenProject image in openDesk

Create and publish release 14.3 video

14.3 Release PR communication: heise and more

Confirm packager build is working across all distributions