Add the js code in .js file

$(document).ready(function(){
function setCookie(cname,cvalue,exdays) {
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = “expires=” + d.toGMTString();
document.cookie = cname + “=” + cvalue + “;” + expires + “;path=/”;
}

function getCookie(cname) {
var name = cname + “=”;
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(‘;’);
for(var i = 0; i < ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ‘ ‘) {
c = c.substring(1);
}
if (c.indexOf(name) == 0) {
return c.substring(name.length, c.length);
}
}
return “”;
}
var lanText = getCookie(“username”);
$(“.dropbtnlang a”).html(lanText);        // show cookie value to user
$(“.dropdown-contentlang .switcher-option a”).click(function(){
var textVal = $(this).html();              //value you want to set in cookie
$.cookie(‘username’, textVal );

});
});

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