Adapt help pages for Assurance Cases
- New pictures to replace old gef/swt screenshots in all pages
- Check for inconsistencies in description
(from redmine: issue id 3950, created on 2020-03-17, closed on 2020-04-06)
- Relations:
- parent #3866 (closed)
(from redmine: issue id 3950, created on 2020-03-17, closed on 2020-04-06)