[mobile] Add format method for the String type.

apps/common/mobile/utils/extendes.js

@@ -42,6 +42,16 @@
 define(
     ['jquery','underscore','framework7'],
     function () {
+        //Extend String
+        if (!String.prototype.format) {
+            String.prototype.format = function() {
+                var args = arguments;
+                return this.replace(/{(\d+)}/g, function(match, number) {
+                    return typeof args[number] != 'undefined' ? args[number] : match;
+                });
+            };
+        }
+
         //Extend jQuery functions
         jQuery.fn.extend( {
             single: function(types, selector, data, fn) {