course-view: add banner "is proposed for Group"
Problem to solve
- If an existing courses is proposed for the festival but has a description that explanes other dates and stuff we want the user to understand that the course is existing already and proposed for the festival
- If openki makes a festival in a region we want the group be visible inside proposed and featured courses.
Further details
Proposal
show a banner inside the coursedetail-header "This Course is proposed for groupName
" if there is a featured group in region and the course has this group