Use the proper escaping method

The type of the description fields is stored in the database as a
string. Fix the issue of custom fields not displayed in the project
admin area.

Change-Id: I3ab857b9d1b7fda28b66b459eab095fe9a88d772
Merge commit 'refs/changes/22/722/1' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Use the proper escaping method

Change-Id: I306c30bf1a1c5cc943d7c5faa4402fac449f0fa8
This is Tuleap 6.3.99.8

Change-Id: I620fe248d2c8797f5e6c0b8a3c5bbfdc96d458eb