tasks #6724: Mustachify tracker settings form

Change-Id: I2454de7992d770dfb3879e2b0f3e637b8f91bb39
Merge commit 'refs/changes/11/2311/3' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6724: Mustachify tracker settings form
This is Tuleap 6.12.99.55

Change-Id: I2493b772add02957b4ff375e31e3c8bacbfa43e1