Localization for controls

Hi everybody!

I'm sure this is pretty simple, but how can I achieve that the controls are shown in German? When I use a date picker, the month values are shown in english by default.

In Android and iOS I could just set the CultureInfo, which is not possible anymore in Xamarin.Forms.

    var ci = new System.Globalization.CultureInfo ("de-DE");
    System.Threading.Thread.CurrentThread.CurrentCulture = ci;

Thank you!
Ronald