Puse locale: en en mis opciones, pero eso no funciona. ¿Debo poner en otro lugar?

 ko.bindingHandlers.datepicker = { init: function (element, valueAccessor, allBindingsAccessor) { //var options = allBindingsAccessor().datepickerOptions || {}; var options = { format: 'MM d, yyyy', autoclose: true, maxDate: 0, language: 'en' }; //console.log("datepicker"); $(element).datepicker(options); //handle the field changing ko.utils.registerEventHandler(element, "change", function () { var observable = valueAccessor(); observable($(element).datepicker("getDate")); }); //handle disposal (if KO removes by the template binding) ko.utils.domNodeDisposal.addDisposeCallback(element, function () { $(element).datepicker("destroy"); }); } };

Estoy usando jquery-ui 1.10.4