{% with widget_id=widget.attrs.id %}
<div class="i18n-fields-widget" role="tabs" data-display="tabs">
    <ul class="i18n-fields-widget tabs">
    {% for subwidget in widget.subwidgets %}
        <li class="i18n-fields-widget tab">
            <label for="{{ widget_id }}_{{ subwidget.lang_code }}">{{ subwidget.lang_name|capfirst }}</label>
        </li>
    {% endfor %}
    </ul>
    {% for subwidget in widget.subwidgets %}
        <div class="i18n-fields-panel" role="tabpanel" id="{{ widget_id }}_{{ subwidget.lang_code }}" data-lang="{{ subwidget.lang_code }}">
            {% include subwidget.template_name with widget=subwidget %}
        </div>
    {% endfor %}
</div>
{% endwith %}