add performance test for dtext, fixes #2051

app/assets/stylesheets/common/020_base.css.scss

@@ -122,3 +122,8 @@ table tfoot {
   color: #666;
   font-style: italic;
 }
+
+.tn {
+  font-size: 0.8em;
+  color: gray;
+}

app/assets/stylesheets/specific/notes.css.scss

@@ -18,11 +18,6 @@ div#note-container {
       line-height: normal;
     }
 
-    p.tn {
-      font-size: 0.8em;
-      color: gray;
-    }
-
     > :last-child {
       margin-bottom: 0;
     }

app/logical/d_text.rb

@@ -19,6 +19,7 @@ class DText
     str.gsub!(/\[i\](.+?)\[\/i\]/i, '<em>\1</em>')
     str.gsub!(/\[s\](.+?)\[\/s\]/i, '<s>\1</s>')
     str.gsub!(/\[u\](.+?)\[\/u\]/i, '<u>\1</u>')
+    str.gsub!(/\[tn\](.+?)\[\/tn\]/i, '<p class="tn">\1</p>')
 
     str = parse_links(str)
     str = parse_aliased_wiki_links(str)