Show weekday names

[ThiefMaster]

Suggestion received from a user:

I'd like to suggest some improvement for this application: display the name of the day in the calendar.
This would help preventing misleading info, for instance when the initial letters of the month are the same as the initial letters of a day: MAR.
Reading too quickly makes people think that the proposal is on a "Mardi".
I just had the case several times in a row.
Moreover, knowing what day is what date would greatly help in general (see illustration).

Obviously we wouldn't want it in red, but showing the name of the week day sounds like a good suggestion

[bundocka]

This feature would also be very useful for when one is trying to find a regular slot for a meeting, and the actual date is not relevant, just the weekday. This could also be implemented as a toggle, something like "regular slot", so it doesn't show the data but just the weekday. Although just adding the weekday name alone would be sufficient and more broadly useful.
Thanks!