Purify words param
Add purification to result display
Remove escape
Merge remote-tracking branch 'origin/3673_Fix_XSS_in_global_search' into tuleap-stable-master

* origin/3673_Fix_XSS_in_global_search:
  Remove escape
  Add purification to result display
  Purify words param

Change-Id: Ia24657bd7d427205b117fccb2d4369b95e668ff2
Tuleap 6.1.99.4

Change-Id: Ia9f4d0dc323fc294223b185045de08b6e1f93e02