Added ugettext_lazy for 403 error page.
Added ugettext_lazy for 403 error page.

FinnStutzenstein/OpenSlides,CatoTH/OpenSlides,boehlke/OpenSlides,ostcar/OpenSlides,OpenSlides/OpenSlides,rolandgeider/OpenSlides,tsiegleauq/OpenSlides,jwinzer/OpenSlides,emanuelschuetze/OpenSlides,FinnStutzenstein/OpenSlides,normanjaeckel/OpenSlides,jwinzer/OpenSlides,CatoTH/OpenSlides,emanuelschuetze/OpenSlides,jwinzer/OpenSlides,OpenSlides/OpenSlides,rolandgeider/OpenSlides,normanjaeckel/OpenSlides,boehlke/OpenSlides,jwinzer/OpenSlides,ostcar/OpenSlides,CatoTH/OpenSlides,emanuelschuetze/OpenSlides,rolandgeider/OpenSlides,FinnStutzenstein/OpenSlides,FinnStutzenstein/OpenSlides,normanjaeckel/OpenSlides,jwinzer/OpenSlides,ostcar/OpenSlides,CatoTH/OpenSlides,tsiegleauq/OpenSlides,tsiegleauq/OpenSlides,boehlke/OpenSlides,boehlke/OpenSlides,normanjaeckel/OpenSlides,emanuelschuetze/OpenSlides