For some reasons BeautifulSouf does not convert entities with convertEntities=["xml","html"], use convertEntities=BeautifulSoup.ALL_ENTITIES instead.
{% load i18n %}{% autoescape off %}{% block content %}{% endblock %}
{% blocktrans with SITE_URL as SITE_URL and notification.desactivate_notification_url as desactivate_notification_url %}If you'd like to unsubscribe from this notification, click the following link: {{ SITE_URL }}{{ desactivate_notification_url }}.{% endblocktrans %}
--
{{ CONF.workspace_name }}
{{ CONF.site_url }}
{% endautoescape %}