(fixes #2450) add translation to 'logout'
(fixes #2450) add translation to 'logout'

C-nakajima/OpenPNE3,ShinichiU/AuthFramework,ShinichiU/OpenPNE3,nishizoe/OpenPNE3,ShinichiU/AuthFramework,upsilon/travis-test,upsilon/travis-test,kashiwasan/symfony-advanced,isaosano/OpenPNE3,C-nakajima/OpenPNE3,ShinichiU/AuthFramework,isaosano/OpenPNE3,kashiwasan/symfony-advanced,ShinichiU/OpenPNE3,nishizoe/OpenPNE3,ShinichiU/OpenPNE3,C-nakajima/OpenPNE3,C-nakajima/OpenPNE3,isaosano/OpenPNE3,isaosano/OpenPNE3,ShinichiU/OpenPNE3