tasks #6605: Replace options by buttons

Change-Id: I68b9fa33194abaa3ef4a8040ca960b8fd5e56282
Merge commit 'refs/changes/43/2243/16' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6605: Replace options by buttons
This is Tuleap 6.12.99.23

Change-Id: I6bf20c3958a03c6b11b3de9b327f1741865eda94