fix logout for mobile devices

Author: nayrnet

www/index.html

@@ -1409,7 +1409,7 @@ <h1 id="theader" data-i18n="Usage this Year">Usage this Year</h1>
                                 </ul>
                             </li>
                             <li id="dLogout" class="divider-vertical" style="display: none;" has-Login-No-Admin=true></li>
-							<li id="mLogout" style="display: none;" has-Login-No-Admin=true><a id="cLogout" href="#Logout"><img src="images/logout.png"> <span data-i18n="Logout">Logout</span></a></li>
+							<li id="mLogout" style="display: none;" has-Login-No-Admin=true><a id="cLogout" href="#Logout"><img src="images/logout.png"> <span class="hidden-phone hidden-tablet" data-i18n="Logout">Logout</span></a></li>
                         </ul>
                 </div>
             </div>