Automattic/jetpack — pull request #632 by rase- (2014-06-03 14:57:14+00:00)
Title: Contact Forms: Add Empty Spam button to feedback.

Adds an Empty Spam button to the spam view when viewing feedback, so that users
are able to delete all spam permanently in one click (similarly to comments).

Addresses https://github.com/Automattic/jetpack/issues/205

I couldn't find any better way to modify actions in tablenav than insert it through JS. Thoughts? I'd be happy to adapt the solution.