Hello Alfred,
There's a problem in retrieving this from the language file because this script is from jQuery and we try to not alter as much and just use whatever translations there are from the script. I tried viewing the script and it does seem to have the appropriate translations as you can see here,
jQuery(function($){
$.datepicker.regional['zh-CN'] = {
closeText: '关闭',
prevText: '<上月',
nextText: '下月>',
currentText: '今天',
monthNames: ['一月','二月','三月','四月','五月','六月',
'七月','八月','九月','十月','十一月','十二月'],
monthNamesShort: ['一月','二月','三月','四月','五月','六月',
'七月','八月','九月','十月','十一月','十二月'],
dayNames: ['星期日','星期一','星期二','星期三','星期四','星期五','星期六'],
dayNamesShort: ['周日','周一','周二','周三','周四','周五','周六'],
dayNamesMin: ['日','一','二','三','四','五','六'],
weekHeader: '周',
dateFormat: 'yy-mm-dd',
firstDay: 1,
isRTL: false,
showMonthAfterYear: true,
yearSuffix: '年'};
$.datepicker.setDefaults($.datepicker.regional['zh-CN']);
});
jQuery(function($){
$.datepicker.regional['zh-TW'] = {
closeText: '關閉',
prevText: '<上月',
nextText: '下月>',
currentText: '今天',
monthNames: ['一月','二月','三月','四月','五月','六月',
'七月','八月','九月','十月','十一月','十二月'],
monthNamesShort: ['一月','二月','三月','四月','五月','六月',
'七月','八月','九月','十月','十一月','十二月'],
dayNames: ['星期日','星期一','星期二','星期三','星期四','星期五','星期六'],
dayNamesShort: ['周日','周一','周二','周三','周四','周五','周六'],
dayNamesMin: ['日','一','二','三','四','五','六'],
weekHeader: '周',
dateFormat: 'yy/mm/dd',
firstDay: 1,
isRTL: false,
showMonthAfterYear: true,
yearSuffix: '年'};
$.datepicker.setDefaults($.datepicker.regional['zh-TW']);
});