story #6053 Defaut textarea for tracker text field

Change-Id: I060a823d532ce681314d5d5a56fb342e88078977
Merge commit 'refs/changes/31/2231/2' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #6053 Defaut textarea for tracker text field
This is Tuleap 6.12.99.2

Change-Id: I69c0ae7eff028d5dc6af8b7294d506c29e4d3065