Не сочтите за наглость, просто сам действительно не могу разобраться.
Есть вот такой кусок кода. в нем вроде все на русском, но при этом в сайте на англ...
* [url]http://jqueryui.com[/url]
* Copyright 2014 jQuery Foundation and other contributors; Licensed MIT */
(function(t,e){function i(){
this._curInst=null,this._keyEvent=!1,
this._disabledInputs=[],
this._datepickerShowing=!1,
this._inDialog=!1,
this._mainDivId="ui-datepicker-div",
this._inlineClass="ui-datepicker-inline",
this._appendClass="ui-datepicker-append",
this._triggerClass="ui-datepicker-trigger",
this._dialogClass="ui-datepicker-dialog",
this._disableClass="ui-datepicker-disabled",
this._unselectableClass="ui-datepicker-unselectable",
this._currentClass="ui-datepicker-current-day",
this._dayOverClass="ui-datepicker-days-cell-over",
this.regional=[ru],
this.regional["ru"]={closeText:"Закрыть",
prevText:"Prev",nextText:"Next",
currentText:"Сегодня",
monthNames:["Январь","Февраль","Март","Апрель","Май","Июнь","Июль","Август","Сентябрь","Октябрь","Ноябрь","Декабрь"],
monthNamesShort:["Янв","Фев","Мар","Апр","Май","Июнь","Июль","Авг","Сент","Окт","Нояб","Дек"],
dayNames: ["Понедельник","Вторник","Среда","Четверг","Пятница","Суббота","Воскресенье"],
dayNamesShort:["ПН","ВТ","СР","ЧТ","ПТ","СБ","ВС"],dayNamesMin:["ПН","ВТ","СР","ЧТ","ПТ","СБ","ВС"],
weekHeader:"Wk",dateFormat:"dd-mm-yy",firstDay:1,isRTL:!1,showMonthAfterYear:!1,yearSuffix:""},
this._defaults={showOn:"focus",showAnim:"fadeIn",showOptions:{},defaultDate:null,appendText:"",buttonText:"...",buttonImage:"",buttonImageOnly:!1,hideIfNoPrevNext:!1,navigationAsDateFormat:!1,gotoCurrent:!1,changeMonth:!1,changeYear:!1,yearRange:"c-10:c+10",showOtherMonths:!1,selectOtherMonths:!1,showWeek:!1,calculateWeek:this.iso8601Week,shortYearCutoff:"+10",minDate:null,maxDate:null,duration:"fast",beforeShowDay:null,beforeShow:null,onSelect:null,onChangeMonthYear:null,onClose:null,numberOfMonths:1,showCurrentAtPos:0,stepMonths:1,stepBigMonths:12,altField:"",altFormat:"",constrainInput:!0,showButtonPanel:!1,autoSize:!1,disabled:!1},
t.extend(this._defaults,this.regional["ru"]),