[ticket/12347] Changed to the new navbar templates

PHPBB3-12347
[ticket/12347] Changed from :after to :before

PHPBB3-12347
[ticket/12347] IE8 compatible CSS selector

PHPBB3-12347
[ticket/12347] Remove unknown/unnecessary hack

PHPBB3-12347
Merge remote-tracking branch 'PayBas/ticket/12347' into develop-ascraeus

* PayBas/ticket/12347:
  [ticket/12347] Remove unknown/unnecessary hack
  [ticket/12347] IE8 compatible CSS selector
  [ticket/12347] Changed from :after to :before
  [ticket/12347] Changed to the new navbar templates