Rails route_translator utf8

Hi,

Im using route_translator gem, which is really great, but unfortunatly
Im
stuck because special caracters are not recognized.
for instance for page /ru/войти , I have this error message

No route matches [GET] "/ru/%D0%B2%D0%BE%D0%B9%D1%82%D0%B8"

same for french special caracters like “è” . for /fr/dernière ,

No route matches [GET] "/fr/derni%C3%A8re"

but if I change in i18n-routes.yml to derniere, /fr/derniere is working
fine.

if this caracters are inside variable, it is working well
for instance if my route is like ‘derniere-:myvar’

if I go to page /fr/derniere-première
it is working well and I have params[:myvar] = “première”

I there anythink I can do to make it works

thanks

PS rake routes give me the right routes