Switch Language

I'm turning my current english only site to a multi-lingual site (currently LtR only, but RtL comming at a later date), but i hit one small snag.
My current language switching method is using a route. the url that the user follows is 'settings/SetLanguage/english'
After the language switch, the user is back at the index page. How can i make sure the user is back at the page it switched the language on.