Load icon when enabling external plugins (not using Marketplace)

It would be great for users that do not use GLPI Marketplace (I didn't use it because our hosting provider didn't provide BZ2 and TAR php extensions) that when enabling a plugin it shows a "loading" when enabling/activating a plug-in like the GLPI Marketplace interface do. Nowadays the browser tab simply shows "loading" but it can lead a user to think that nothing is happening and click on install/activate button twice.