Release 2.3.0 (2021-05-27)

Full Changelog

• Add versions tab to activity view in article details (#574) (@nnatter)
• Adjust translation keys for activity descriptions (#570) (@nnatter)
• Fix activity tab for multiple article types (#566) (@nnatter)
• Add activity view and restore domain event (#565) (@Prokyonn)
• Add domain events for articles (#561) (@wachterjohannes)