Renames comments intro variable

templates/comments.html

@@ -1,6 +1,6 @@
 {% if DISQUS_SITENAME and SITEURL and article.status != "draft" %}
 <section>
-{% if ELEGANT_COMMENT_MESSAGE %}
+{% if COMMENTS_INTRO %}
 <hr/>
 <p id="comment-message">{{ ELEGANT_COMMENT_MESSAGE }} </p>
 {% endif %}