[Feature] Allow Graphical Calendar Week column header date format to be edited by the user.

[asperitigroup]

🚀 feature request

Describe the solution you'd like

In user preferences, allow the user to specify the date format of the graphical calendar week view column header to conform to their national date format. At the moment, the column header date is a fixed format of mm/dd, which is standard US date format. In the UK we use dd/mm/yyyy so it would be good to be able to change the format for the calendar week view column header to dd/mm e.g. 19/10 would be the 19th October. Perhaps that might be best placed near the existing user date format preference and be labelled "Calendar View column header date format"

In this section would be most appropriate.

Is your feature request related to a problem? Please describe.

Not related to a problem, just a desirable feature.

Describe alternatives you've considered

I have considered editing the source code files, but I am not competent to do this safely.

Additional context