fix(calendar): shortyear handling was broken

the short year settings centuryBreak and currentCentury were broken/not respected

Author: lubber-de

src/definitions/modules/calendar.js

@@ -1699,7 +1699,8 @@
                 text = settings.monthFirst || !/^\d{1,2}[./-]/.test(text) ? text : text.replace(/[./-]/g, '/').replace(/(\d+)\/(\d+)/, '$2/$1');
                 var textDate = new Date(text);
                 var numberOnly = text.match(/^\d+$/) !== null;
-                if (!numberOnly && !isNaN(textDate.getDate())) {
+                var isShortYear = text.match(/^(?:\d{1,2}[./-]){2}\d{1,2}$/) !== null;
+                if (!isShortYear && !numberOnly && !isNaN(textDate.getDate())) {
                     return textDate;
                 }
                 text = text.toLowerCase();