anchor.diff:        if (false)
           .row
             .col-md-1
  -              |Markdown<br>
  +            p="Markdown"
             +leftcolumn 
                 .panel.panel-default
                   .panel-body #{article["markdown"+params.left_lang]}
  
positive.code:             textarea.form-control(id="unpublishReference" name="unpublishReference" rows=1) #{article.unpublishReference}
          .row
            .col-md-1
              |Title <br>
            .col-md-7
              textarea.form-control(name="title",rows=1) #{article.title}
            .col-md-3
  
negative.code:             button.btn.btn-large.btn-default(type = "button" onclick ="window.onbeforeunload=null; location.href='#{layout.htmlroot}/article/#{article.id}?edit=false&style=#{params.style}';") Cancel
            .row
            .col-md-1
              p="Predecessor"
            +leftcolumn
              select(id="predecessor",name="predecessorId").form-control
                if typeof(article.predecessorId)=="undefined"
  