Fixed datepicker problem when using non en-US locale.

Author: rogyar

lib/web/mage/utils/misc.js

@@ -245,7 +245,7 @@ define([
         convertToMomentFormat: function (format) {
             var newFormat;
 
-            newFormat = format.replace(/yy|y/gi, 'YYYY'); // replace the year
+            newFormat = format.replace(/yyyy|yy|y/, 'YYYY'); // replace the year
             newFormat = newFormat.replace(/dd|d/g, 'DD'); // replace the day
 
             return newFormat;