twitter_zuil/templates/flash_template.html

{% with messages = get_flashed_messages() %}
    {% if messages %}
    <div class="messages">
        <ul class="flashes">
            {% for message in messages %}
                <li>
                    {{ message }}
                </li>
            {% endfor %}
        </ul>
    </div>
    {% endif %}
{% endwith %}