pelican-red/templates/_translations.html

{% macro translations_for(article) %}
{% if article.translations %}
<li>Translations: 
{% for translation in article.translations %}
<a href="{{ SITEURL }}/{{ translation.url }}">{{ translation.lang }}</a>
{% if not loop.last %},{% endif %}
{% endfor %}
</li>
{% endif %}
{% endmacro %}