{% load l10n %}
{% for group, subgroup, index in widget.optgroups %}
    {% if group %}<strong>{{ group }}</strong>{% endif %}
    {% for option in subgroup %}
        <div class="form-check">
            <input class="form-check-input"
                   type="{{ option.type }}"
                   name="{{ option.name }}"
                   value="{{ option.value|unlocalize }}"
                   id="{{ option.attrs.id }}"
                   {% if option.selected %}checked{% endif %}>
            <label class="form-check-label" for="{{ option.attrs.id }}">{{ option.label|unlocalize }}</label>
        </div>
    {% endfor %}
{% endfor %}