{% load i18n %}
{% load url from future %}

<form action="{% url 'shop_buy' form.offer.entry.slug %}" method="post">
    <table>
    {{ form.as_table }}
    <tr><td></td><td>
        <button type="submit" style="border: none; background: none; cursor: pointer">
        <img alt="{% trans 'Donate!' %}" src="{% static 'img/payu.png' % }" />
        </button>
        </td></tr>
    </table>
</form>