Add UTF-8 characters to demo pages for testing purposes

extensions/demos/html/basic.html

@@ -33,5 +33,6 @@
     <p><textarea type="text" id="imptxt" name="Important Text" style='width: 400px; margin: 0 auto;'></textarea></p>
     <p>You can also load up a more <a href="butcher/index.html">advanced demo page</a>.</p>
   </div>
+  <!-- UTF-8 characters for testing purposes: 牛肉 -->
 </body>
 </html>

extensions/demos/html/secret_page.html

@@ -21,6 +21,6 @@
 	</ul>
 
     <label for="imptxt">Insert your secret here:</label>&nbsp;&nbsp;<input type="text" id="imptxt" name="Important Text" /></p>
-
+    <!-- UTF-8 characters for testing purposes: 牛肉 -->
 </body>
 </html>