Fixes #3842: correct save button activation
Merge pull request #308 from ncharles/bug_3842/dev/correct_save_button

Bug 3842/dev/correct save button
Merge branch 'branches/rudder/2.4' into branches/rudder/2.6

Conflicts:
	rudder-web/src/main/scala/com/normation/rudder/web/components/NodeGroupForm.scala
	rudder-web/src/main/webapp/javascript/rudder/rudder.js