Deleting a Notebook is vulnerable to XSS attach

Problem Statement : Deleting a Notebook is vulnerable to XSS attach

Issue reproducing :

1) create a notebook
2) give the permission to notebook as : <script>alert('hi')</script> (press space after writing this, not enter key)
3) after this, try to delete the notebook, the BootstrapDialog that popups stating insufficient privilages is vulnerable to XSS attack

analysis : https://github.com/apache/zeppelin/blob/dda5a145249538eb5a49e452e34f9c5779e0ad87/zeppelin-web/src/components/websocket/websocket-event.factory.js#L110

in thi part of code we should sanitize the input given to bootStrapDialog with _.escape