pickadate weekdaysShort defaults doesn't work

[sakulstra]

Pickadate defaults doesn't work for "weekdaysShort" - everything else works like expected.

I've this in my client Startup:

$.extend($.fn.pickadate.defaults, {
        monthsFull: ['Januar', 'Februar', 'März', 'April', 'Mai', 'Juni', 'Juli', 'August', 'September', 'Oktober', 'November', 'Dezember'],
        monthsShort: ['Jan', 'Feb', 'Mär', 'Apr', 'Mai', 'Jun', 'Jul', 'Aug', 'Sep', 'Okt', 'Nov', 'Dez'],
        weekdaysFull: ['Sonntag', 'Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag'],
        weekdaysShort: ['So', 'Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa'],
        today: 'Heute',
        clear: 'Löschen',
        close: 'X',
        firstDay: 1,
        format: 'dddd, dd. mmmm yyyy',
        formatSubmit: 'yyyy/mm/dd'
    })

[djhi]

Future work on this package has been transferred here.