Restyle level1 and level2 navigation bar on Mediawiki service

Change-Id: Ie17cc18f46daa4ed241d24cf5ca8c6d3a837dda9
Merge commit 'refs/changes/68/1368/1' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Restyle level1 and level2 navigation bar on Mediawiki service

Change-Id: I880d3f6bd0bdb6a3c88315aaaac5ea5b8d4a2494
This is Tuleap 6.6.99.12

Change-Id: Ie7b9933eaaf8d428138c56516a350a25c2855ee7