Fix header/nav overlap in certain langs
Fix header/nav overlap in certain langs

Closes bug 689819.

johngian/mozillians,fxa90id/mozillians,glogiotatidis/mozillians-new,satdav/mozillians,anistark/mozillians,fxa90id/mozillians,mozilla/mozillians,hoosteeno/mozillians,satdav/mozillians,akarki15/mozillians,ChristineLaMuse/mozillians,justinpotts/mozillians,mozilla/mozillians,mozilla/mozillians,johngian/mozillians,chirilo/mozillians,brian-yang/mozillians,akatsoulas/mozillians,justinpotts/mozillians,akarki15/mozillians,fxa90id/mozillians,justinpotts/mozillians,fxa90id/mozillians,hoosteeno/mozillians,brian-yang/mozillians,akarki15/mozillians,satdav/mozillians,anistark/mozillians,akatsoulas/mozillians,akatsoulas/mozillians,johngian/mozillians,brian-yang/mozillians,satdav/mozillians,safwanrahman/mozillians,mozilla/mozillians,chirilo/mozillians,justinpotts/mozillians,safwanrahman/mozillians,johngian/mozillians,safwanrahman/mozillians,ChristineLaMuse/mozillians,akatsoulas/mozillians,hoosteeno/mozillians,glogiotatidis/mozillians-new,hoosteeno/mozillians,glogiotatidis/mozillians-new,akarki15/mozillians,safwanrahman/mozillians,anistark/mozillians,glogiotatidis/mozillians-new,ChristineLaMuse/mozillians,brian-yang/mozillians,chirilo/mozillians,chirilo/mozillians,anistark/mozillians