users/templates/registration/activation_email.html
{% load i18n %}
{% autoescape off %}
<body>
<p>
{% blocktrans %}You're receiving this email because you created an account on {{ site }}.{% endblocktrans %}
</p>
<p>
{% trans "Please go to the following page to activate your account:" %}
{% block reset_link %}
<a href="http://{{ site }}{% url 'registration_activate' activation_key=activation_key %}">http://{{ site }}{% url 'registration_activate' activation_key=activation_key %}</a>
{% endblock %}
</p>
<p>
{% trans "Thanks for using our site!" %}
</p>
<p>
{% blocktrans %}The {{ site }} team{% endblocktrans %}
</p>
</body>
{% endautoescape %}