Use the form helpers templatetag module in the addreviewer template.
{% extends "base.html" %}
{% load i18n %}
{% block breadcrumbs %}<div class="breadcrumbs"><a href="../">{% trans 'Home' %}</a></div>{% endblock %}
{% block content %}
<p>{% trans "Thanks for spending some quality time with the Web site today." %}</p>
{% endblock %}