Can you explain this part more. I am unfamiliar with ant. I do not see it in any of the documentation either. Also, I believe it has been fixed per Bug 16855 - Zimbra showing up on print email screen but the explanation there is no better.
If you are running in a dev environment, then "ant deploy" under ZimbraWebClient folder should do the trick. If you're running production, run "ant prod-deploy"