Improvements

• Make list of event room bookings sortable (#4022)
• Log when a booking is split during editing (#4031)
• Improve "Book" button in multi-day events (#4021)

Bugfixes

• Add missing slash to the template_prefix of the designer module
• Always use HH:MM time format in book-from-event link
• Fix timetable theme when set to "indico weeks view" before 2.2 (#4027)
• Avoid flickering of booking edit details tooltip
• Fix outdated browser check on iOS (#4033)