May be you need to change te ChatUI_IE.Ascx manually :

 

 <div id="divroomtitle">
  <div style="font-family: verdana; font-size: 11pt;padding:5px;font-weight:bold;">
   <%=Title%>
  </div>
  <img width="32" height="28" src="images/users_icon.gif" alt="" align="absmiddle" />
  <span id="peoplecount"></span>
  <%=SS.NumPeoplesChatting%>
 </div>

 

Regards , Terry .