Warning message to save changes - buttons do not fit well

The warning message displayed when closing a document and potentially losing unsaved changes has three buttons that do not fit the form properly. The Cancel button is clipped. Either the buttons need to be smaller, or the modal window bigger.

Steps to reproduce:

1. open an article
2. click the Edit button
3. close the article by clicking the small 'x' next to the article name tab

Result:

Warning message with "Save" "Discard" or "Cancel" options. "Cancel" button is clipped and cannot be read.

Expected:

Either reduce button size or increase modal size to accommodate the buttons