dayNamesShort:["So","Mo","Di","Mi","Do","Fr","Sa"] => 2 letter days

I have looked up and down but I don't know how to change in the overview module to spell the days of the week with just two letters on this site: http://www.vhs-lengerich.de/joomla

I know it must be hidden somewhere in the #datepicker with daynamesmin, but I cannot seem to find either the datepicker (is it part of the full开发者_运维百科calendar.min.js?) or part of a module where this can be configured.

Where is the correct place to configure two letter day names, as they are used in German?

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Assuming the site is using jQuery UI Datepicker indeed, you could just set the days after initializing the datepicker like this:

$("#datepicker").datepicker("option", "dayNamesMin", ['So','Mo','Di','Mi','Do','Fr','Sa'] );