{% for language in languages %}
<div class="custom-control custom-radio radio-primary form-check">
    <input id="language_{{loop.index}}" name="language" type="radio" required class="custom-control-input" value="{{language.languageCode}}">
    <label class="custom-control-label" for="language_{{loop.index}}">    
        {{language.languageCode}}
    </label>
</div>
{% endfor %}