OSIS-5484 adapt AcademicCalendar in proposal form
OSIS-5484 adapt AcademicCalendar in proposal form

uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/OSIS-Louvain