Show room jid in a tooltip

src/templates/chatroom_head.html

@@ -2,7 +2,7 @@
 {[ if (affiliation == 'owner') { ]}
     <a class="chatbox-btn configure-chatroom-button icon-wrench" title="{{{info_configure}}} "></a>
 {[ } ]}
-<div class="chat-title">
+<div class="chat-title" title="{{{jid}}}">
     {{{ name }}}
     <p class="chatroom-description">{{{ description }}}<p/>
 </div>