When comment_id_key is passed as URL parameter, focus on this comment, instead of the top comment of the related thread.
{% extends "email/base_email_notification.txt" %}{% load i18n %}{% block content %}{% blocktrans %}Notification:{% endblocktrans %}
{{ activity.printable_data_nohtml_link }}
({{ activity.printable_metadata_absolute }})
{% endblock %}