Sprint 12 Release

What's Changed

• fix/remove and replace old not working db test
• Add planning document and feature board of sprint 12
• Fix/update qa bot
• Feature/150 demo day slide
• Feature/137 send response in smaller parts
• add demo day poster (issue #153)
• add demo day product management poster
• Add demo day video
• Db backup
• Feature/169 deepl cost issue

Full Changelog: sprint-11-release...sprint-12-release