Aspera deletion transfer fails

Trying to delete a given transfer will fail with a javascript error. the main problem is the fact that the click handler is done on the item of the menu (share and deletion) and when we click on the `span` or the `icon` it will not find the data on the event target. the data is an attribute of the item and it represents the Nuxeo document of the transfer.

As a second point the functionals tests fails and it because of the deletion scenario, this should be also fixed.