JSFiddle - React, Tailwind, and code Playground

HTML

<input name="language" id="lang1" value="0" type="radio">
<label title="Czech">česky</label>
<input name="language" id="lang2" value="1" type="radio">
<label title="Polish">polsky</label>
<input name="language" id="lang3" value="2" type="radio">
<label title="German">německy</label>
<input name="language" id="lang4" value="3" type="radio">
<label title="French">francouzsky</label>
<input name="language" id="lang5" value="4" type="radio">
<label title="Spanish">španělsky</label>
<input name="language" id="lang6" value="5" type="radio">
<label title="English">anglicky</label>

JavaScript

$('input[name="language"]').on('change', function(e) {
    var language = e.target.value;
    alert(language);
});