Add loading state on the modal submit button.

Change-Id: I2b8178726e2a27de89c422f1bd0d991193709a8a
Merge commit 'refs/changes/17/1817/2' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Add loading state on the modal submit button.

Change-Id: Ia8534b62d149d4c093a09f9fda6927e3fbd2dcde
This is Tuleap 6.9.99.40

Change-Id: I46f9adca75c29ee43b494462d782f0e168e31fb8