Add test showing how error translation works in FormHelper.
Add test showing how error translation works in FormHelper.

Refs #5382

kumamidori/cakephp,thinkingmedia/cakephp,ADmad/cakephp,HavokInspiration/cakephp,erikfig/cakephp,berrygoudswaard/cakephp,jeffblack360/cakephp,HavokInspiration/cakephp,ionas/cakephp,mvdriel/cakephp,eryw/cakephp,web-player/cakephp,tenkoma/cakephp,nrother/cakephp,Phillaf/cakephp,mvdriel/cakephp,khoimt/cakephp-study,akintoey/cakephp,garethellis36/cakephp,HavokInspiration/cakephp,jerems02/cakephp,ionas/cakephp,ndm2/cakephp,michaelze/cakephp,Balachan27/cakephp,garethellis36/cakephp,Balachan27/cakephp,mvdriel/cakephp,pbaire/cakephp,thinkingmedia/cakephp,cakephp-fr/cakephp,web-player/cakephp,petteyg/cakephp,ndm2/cakephp,eryw/cakephp,CVO-Technologies/cakephp,berrygoudswaard/cakephp,ndm2/cakephp,gmponos/cakephp,ADmad/cakephp,eboominathan/cakephp,nrother/cakephp,jjj117/cakephp,ADmad/cakephp,ndm2/cakephp,tenkoma/cakephp,jjj117/cakephp,bravo-kernel/cakephp,tgr0ss/cakephp,yinhe007/cakephp,eboominathan/cakephp,timhoeppner/cakephp,eboominathan/cakephp,cakephp/cakephp,erikfig/cakephp,davidyell/cakephp,burriko/cakephp,CakeDC/cakephp,CVO-Technologies/cakephp,adopico/cakephp,nrother/cakephp,dakota/cakephp,khoimt/cakephp-study,jeffblack360/cakephp,davidyell/cakephp,justinyost/cakephp,ionas/cakephp,tgr0ss/cakephp,thinkingmedia/cakephp,kumamidori/cakephp,yinhe007/cakephp,michaelze/cakephp,elboletaire/cakephp,yinhe007/cakephp,pbaire/cakephp,cakephp/cakephp,adopico/cakephp,Phillaf/cakephp,burriko/cakephp,bravo-kernel/cakephp,CakeDC/cakephp,petteyg/cakephp,tisu2tisu/cakephp,petteyg/cakephp,davidyell/cakephp,web-player/cakephp,jerems02/cakephp,cakephp-fr/cakephp,adopico/cakephp,cakephp/cakephp,CakeDC/cakephp,tgr0ss/cakephp,cakephp-fr/cakephp,Phillaf/cakephp,cakephp/cakephp,mvdriel/cakephp,justinyost/cakephp,garethellis36/cakephp,jjj117/cakephp,dakota/cakephp,tenkoma/cakephp,dakota/cakephp,dkarvounaris/cakephp,erikfig/cakephp,justinyost/cakephp,gmponos/cakephp,tisu2tisu/cakephp,bravo-kernel/cakephp,kumamidori/cakephp,khoimt/cakephp-study,jerems02/cakephp,elboletaire/cakephp,dkarvounaris/cakephp,ADmad/cakephp,jeffblack360/cakephp,burriko/cakephp,dkarvounaris/cakephp,dakota/cakephp,tenkoma/cakephp,elboletaire/cakephp,eryw/cakephp,Balachan27/cakephp,gmponos/cakephp,michaelze/cakephp,timhoeppner/cakephp,CVO-Technologies/cakephp,garethellis36/cakephp,berrygoudswaard/cakephp,pbaire/cakephp,timhoeppner/cakephp,CakeDC/cakephp,tisu2tisu/cakephp,akintoey/cakephp,akintoey/cakephp,petteyg/cakephp