Formbuilder datetime field: picker starts with sunday

[joe_ma]

Hi everyone

I have a form built with the formbuilder module that uses a datetime field with a date picker. The frontend is in German but it is not a multi language site, so the backend is in English. Is there a way to have the date picker showing the German version in the frontend and the weeks beginning with a monday not a sunday?

pw: 3.0.148
FormBuilder: 0.2.4

Locale is set to setlocale(LC_ALL, 'de_CH.UTF-8') in the config.php