when data convert in Excel that time marathi data changed

I have table export in Excel file that time Marathi data is automatically converted in another language but I want this Marathi data as it in Excel file column.

please check below my code.

please help me.

function fnExcelReport() {
var tab_text = " ";
var textRange; var j = 0;
tab = document.getElementById('headerTable'); // id of table
for (j = 0 ; j < tab.rows.length ; j++) {
tab_text = tab_text + tab.rows[j].innerHTML + "";
//tab_text=tab_text+"";
}
tab_text = tab_text + "";
tab_text = tab_text.replace(/]*>|<\/A>/g, "");//remove if u want links in your table
tab_text = tab_text.replace(/]*>/gi, ""); // remove if u want images in your table
tab_text = tab_text.replace(/]*>|<\/input>/gi, ""); // reomves input params
var ua = window.navigator.userAgent;
var msie = ua.indexOf("MSIE ");
if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)) // If Internet Explorer
{
txtArea1.document.open("txt/html", "replace");
txtArea1.document.write(tab_text);
txtArea1.document.close();
txtArea1.focus();
sa = txtArea1.document.execCommand("SaveAs", true, "Say Thanks to MIPL.xls");
}
else //other browser not tested on IE 11
sa = window.open('data:application/vnd.ms-excel,' + encodeURIComponent(tab_text));
return (sa);
}