Introduced AbstractProject.supportsMakeDisabled rather than using trick of checking for parent instanceof Jenkins.
Extracted common GUI into makeDisabled.jelly, with accompanying I18N refactoring.
Also moved all this into AbstractProject, where the relevant methods are defined, rather than Job where they are not.

Added a new WipeOut permission (enabled through the hudson.security.WipeOutPermission system property) to control the "Wipe Out Workspace" action

http://jenkins.361315.n4.nabble.com/jenkinsci-ja-142-td3474686.html#a3556651

I wasn't initially planning to do this, but it turns out more people needed this feature than I thought.

I left the text as is, but defined a mechanism to override this in the plugin, in a possibly context sensitive way. For example, a plugin can replace this text on a job-by-job basis, or by looking at some property/builder/etc.