JSFiddle - React, Tailwind, and code Playground

HTML

<button id="en">English</button><button id="de">German</button><button id="es">Spanish</button><div id="text"></div>
<br /><br />
<div id="cur"></div>

JavaScript

var lang="de";

$('#en').click(function (){
    lang="en";
});
$('#de').click(function (){
    lang="de";
});
$('#es').click(function (){
    lang="es";
});

function showtext(){

  $('#text').text(lang); 
    if (lang="en"){
        $('#cur').text(lang);
    }
    else if (lang="de"){
        $('#cur').text(lang);
    }
    else if (lang="es"){
        $('#cur').text(lang);
    }
}
showtext();
setInterval(function() {
        showtext();
    }, 2000);