{% load wagtailadmin_tags i18n %}
<legend>{{ self.verbose_name }}</legend>
<ul class="fields">
  <li>
    <div class="field">
      <label for="{{ self.children.0.id_for_label }}">{{ self.verbose_name }}</label>
      <div class="field-content">
        <div class="field-content">
          <ul class="fields">
          {% for child in self.children %}
              <li class="{{ child.classes|join:" " }}">
                {% if forloop.first %}
                  <label for="{{ child.id_for_label }}">{{ child.heading }}</label>
                {% endif %}
                {{ child.bound_field}}
                {% if child|has_unrendered_errors %}
                  <p class="error-message">
                    {% for error in field.errors %}
                      <span>{{ error|escape }}</span>
                    {% endfor %}
                  </p>
                {% endif %}
              </li>
          {% endfor %}
          </ul>
        </div>
      </div>
    </div>
  </li>
</ul>