Calendar: Fix German localization

Author: fnagel

external/localization.js

@@ -2767,10 +2767,10 @@ var regions = {
 		"dateFormat": "d"
 	},
 	"de": {
-		"closeText": "schlie\u00dfen",
-		"prevText": "<zur\u00fcck",
+		"closeText": "Schlie\u00dfen",
+		"prevText": "<Zur\u00fcck",
 		"nextText": "Vor>",
-		"currentText": "heute",
+		"currentText": "Heute",
 		"weekHeader": "Wo",
 		"dateFormat": "d"
 	},

tests/unit/calendar/calendar_core.js

@@ -89,7 +89,7 @@ test( "Localization", function() {
 			);
 			equal(
 				element.find( ".ui-calendar-prev" ).text(),
-				"<zurück", message + "header prev"
+				"<Zurück", message + "header prev"
 			);
 			equal(
 				element.find( ".ui-calendar-next" ).text(),