Fix request #7163 mediawiki page broken on new Tuleap themes

Change-Id: Ib702aae1542c51f56c35a04bac12cc8883bdf7ce
Merge commit 'refs/changes/30/2730/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #7163 mediawiki page broken on new Tuleap themes

Change-Id: I72ec5361df202889b996a974bf8c523fde2b8a12
This is Tuleap 7.2.99.25

Change-Id: Ib780eb071767969e16c0b86775382da6243966e7