{% load i18n %}
<em>
{% url 'wiki:signup' as signup_url %}
{% url 'wiki:login' as login_url %}
{% if login_url and signup_url %}
  {% blocktrans %}
  You need to <a href="{{ login_url }}">log in</a> or <a href="{{ signup_url }}">sign up</a> to use this function.
  {% endblocktrans %}
{% else %}
  {% trans "You need to log in or sign up to use this function." %}
{% endif %}
</em>
