I put locale: en in my options, but that doesnt work. Should I put somewhere else?

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");
        });
    }
};

Im using jquery-ui 1.10.4