Precompile datepicker i18n files for each language.

Not an optimal solution, because it uses files from our own repository instead of the bundle, but found no other solution for now.

app/assets/javascripts-jquery-ui/datepicker-de.js

@@ -0,0 +1,37 @@
+/* German initialisation for the jQuery UI date picker plugin. */
+/* Written by Milian Wolff (mail@milianw.de). */
+( function( factory ) {
+	if ( typeof define === "function" && define.amd ) {
+
+		// AMD. Register as an anonymous module.
+		define( [ "../widgets/datepicker" ], factory );
+	} else {
+
+		// Browser globals
+		factory( jQuery.datepicker );
+	}
+}( function( datepicker ) {
+
+datepicker.regional.de = {
+	closeText: "Schließen",
+	prevText: "<Zurück",
+	nextText: "Vor>",
+	currentText: "Heute",
+	monthNames: [ "Januar","Februar","März","April","Mai","Juni",
+	"Juli","August","September","Oktober","November","Dezember" ],
+	monthNamesShort: [ "Jan","Feb","Mär","Apr","Mai","Jun",
+	"Jul","Aug","Sep","Okt","Nov","Dez" ],
+	dayNames: [ "Sonntag","Montag","Dienstag","Mittwoch","Donnerstag","Freitag","Samstag" ],
+	dayNamesShort: [ "So","Mo","Di","Mi","Do","Fr","Sa" ],
+	dayNamesMin: [ "So","Mo","Di","Mi","Do","Fr","Sa" ],
+	weekHeader: "KW",
+	dateFormat: "dd.mm.yy",
+	firstDay: 1,
+	isRTL: false,
+	showMonthAfterYear: false,
+	yearSuffix: "" };
+datepicker.setDefaults( datepicker.regional.de );
+
+return datepicker.regional.de;
+
+} ) );