Set up spaces for date characters in calendar

[marsson]

As a system user I want to be able to view up to 4characters that represent special dates inside each date on the calendar, so I can see multiple special dates per day

A.C.
Given I am a system user, with an open and configured page with a valid calendar with multiple single day dates configured fort the same day, THEN I will see up to 4 dates, broken into quadrants on the same day.

This will require some change in the Dom and css.