Localizing the DateTimePicker Time Text

HTML

<script src="https://raw.github.com/trentrichardson/jQuery-Timepicker-Addon/master/jquery-ui-timepicker-addon.js"></script>
<link rel="stylesheet" href="https://raw.github.com/trentrichardson/jQuery-Timepicker-Addon/master/jquery-ui-timepicker-addon.css">
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.18/themes/vader/jquery-ui.css">
<br/>
  <br/>
<input class="order-date" type="text">
<select id="calendar-culture">
    <option value="en">English</option>
    <option value="it">Italian</option>
</select>

JavaScript

$(document).ready(function() {
    $(".order-date").datetimepicker({
        ampm: true
    });
    $("#calendar-culture").change(function() {
        $.datepicker.regional['it'] = {
            closeText: 'Chiudi',
            prevText: '&#x3c;Prec',
            nextText: 'Succ&#x3e;',
            currentText: 'Oggi',
            monthNames: ['Gennaio', 'Febbraio', 'Marzo', 'Aprile', 'Maggio', 'Giugno',
                            'Luglio', 'Agosto', 'Settembre', 'Ottobre', 'Novembre', 'Dicembre'],
            monthNamesShort: ['Gen', 'Feb', 'Mar', 'Apr', 'Mag', 'Giu',
                            'Lug', 'Ago', 'Set', 'Ott', 'Nov', 'Dic'],
            dayNames: ['Domenica', 'Luned&#236', 'Marted&#236', 'Mercoled&#236', 'Gioved&#236', 'Venerd&#236', 'Sabato'],
            dayNamesShort: ['Dom', 'Lun', 'Mar', 'Mer', 'Gio', 'Ven', 'Sab'],
            dayNamesMin: ['Do', 'Lu', 'Ma', 'Me', 'Gi', 'Ve', 'Sa'],
            weekHeader: 'Sm',
            dateFormat: 'dd/mm/yy',
            firstDay: 1,
            isRTL: false,
            showMonthAfterYear: false,
            yearSuffix: ''
        };
        $.datepicker.regional['en'] = {
            closeText: 'Done',
            prevText: 'Prev',
            nextText: 'Next',
            currentText: 'Today',
            monthNames: ['January', 'February', 'March', 'April', 'May', 'June',
                        'July', 'August', 'September', 'October', 'November', 'December'],
            monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
                        'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
            dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
            dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
            dayNamesMin: ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
            weekHeader: 'Wk',
            dateFormat: 'dd/mm/yy',
            firstDay: 1,
            isRTL: false,
            showMonthAfterYear: false,
     ...