Fixes #507, ensures that /tutorials|features|mobile|gaming|business have trailing / added

These pages were being tracked by Analytics as two pages, for example /en/mobile and /en/mobile/  This fix causes /en/mobile to issue a 301 (Moved Permanently) and redirect the user to /en/mobile/  Also tested and verified with query strings, for example /en/tutorails?page=2 will redirect to /en/tutorials/?page=2