  <script>
    $(function(){
      // var comment_{{counter}} = '{{comment.content|escapejs}}';
      // var converter = new Showdown.converter();
      // var html = converter.makeHtml(comment_{{counter}});
      // $("#div_comment_r_{{counter}}").html(html)

      //leave this code here because we'll need somethink like this to add a js markdown preview
    });
  </script>

	<a href="{{comment.author.get_view_link}}"><img src="{{comment.author.gravatar_url_medium}}"> {{ comment.author.getUserInfo.screenName }}</a>
  added a comment - 
	<span title="{{ comment.creationDate }}">{{ comment.creationDate|date:"D, d/M/Y" }}</span>
  {% ifequal comment.author.id user.id %}
    <a href="javascript:showEditComment({{counter}})" name="selector-edit-comment"><i class="icon-pencil"></i></a>
  {% endifequal %}
  {% if comment.was_edited %}
      <!-- loadCommentHistory must be defined in the including page -->
    <a href="#" onclick="loadCommentHistory({{ comment.id }})" style="color:red">edited</a>
  {% endif %}
  <div  id="div_comment_r_{{counter}}">
    {% load markdown %}
    {% autoescape off %}
    {{ comment.content|markdown }}    
    {% endautoescape %}
  </div>
  {% ifequal comment.author.id user.id %}
  {% include 'core/edit_comment_form.html' %}
  {% endifequal %}

  <script>
    $(function(){
      // var comment_{{counter}} = '{{comment.content|escapejs}}';
      // var converter = new Showdown.converter();
      // var html = converter.makeHtml(comment_{{counter}});
      // $("#div_comment_r_{{counter}}").html(html)

      //leave this code here because we'll need somethink like this to add a js markdown preview
    });
  </script>

	<a href="{{comment.author.get_view_link}}"><img src="{{comment.author.gravatar_url_medium}}"> {{ comment.author.getUserInfo.screenName }}</a>
  commented - 
	<span title="{{ comment.creationDate }}">{{ comment.creationDate|date:"D, d/M/Y" }}</span>
  {% ifequal comment.author.id user.id %}
    <a href="javascript:showEditComment({{counter}})" name="selector-edit-comment"><i class="icon-pencil"></i></a>
  {% endifequal %}
  {% if comment.was_edited %}
      <!-- loadCommentHistory must be defined in the including page -->
    <a href="#" onclick="loadCommentHistory({{ comment.id }})" style="color:red">edited</a>
  {% endif %}
  <div  id="div_comment_r_{{counter}}">
    {% load markdown %}
    {% autoescape off %}
    {{ comment.content|markdown }}    
    {% endautoescape %}
  </div>
  {% ifequal comment.author.id user.id %}
  {% include 'core/edit_comment_form.html' %}
  {% endifequal %}

Change "added a comment" to "commented"
Change "added a comment" to "commented"