Update DatePicker.d.ts (react-toolbox#1411)

Type fixing.

Author: ismail-codar

components/date_picker/DatePicker.d.ts

@@ -132,7 +132,7 @@ export interface DatePickerProps extends ReactToolbox.Props {
    * Sets locale for the Dialog.
    * @default "en"
    */
-  locale?: "de" | "no" | "en" | "es" | "af" | "ar" | "be" | "bg" | "bn" | "bo" | "br" | "bs" | "ca" | "gl" | "eu" | "pt" | "it" | "fr" | "ru" | "ua" | "zh-cn" | "zh-hk" | "zh-tw" DatePickerLocale;
+  locale?: "de" | "no" | "en" | "es" | "af" | "ar" | "be" | "bg" | "bn" | "bo" | "br" | "bs" | "ca" | "gl" | "eu" | "pt" | "it" | "fr" | "ru" | "ua" | "zh-cn" | "zh-hk" | "zh-tw" | DatePickerLocale;
   /**
    * Date object with the maximum selectable date.
    */