[fix] Mobile: Logout button not accessible in the left menu

www/templates/menu.html

@@ -78,7 +78,7 @@
           <cs-extension-point name="menu-profile-user"></cs-extension-point>
         </div>
         <!-- logout -->
-        <a ng-if="login" class="button-icon" ng-click="logout({askConfirm: true})" style="position: absolute; top: 5px; left: 5px;">
+        <a ng-if="login" class="button-icon" ng-click="logout({askConfirm: true})" style="position: absolute; top: 5px; left: 5px; z-index: 999;">
           <i class="icon stable ion-android-exit"></i>
         </a>
       </div>