Fix confidentiality note on epic's comment field
When a confidential epic is created, it shows the following message on top of the comment text field:
![epic_confidential_message](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
It should be " This is a confidential epic. People without permission will never get a notification."