Fix JS behaviour on textarea and followup body_format selectbox on Firefox

Change-Id: Ib07b38a9cfc073f473bec8e18a52265d35fbb2fd
Merge commit 'refs/changes/65/1565/3' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Fix JS behaviour on textarea and followup body_format selectbox on Firefox

Change-Id: I75532e3a9472c219327aa683d64e55d7a67c8039
This is Tuleap 6.8.99.2

Change-Id: Ifbac27b1cf73605113d22730656eeef2b74aa74e