Multilingual site

I have a site in which people will post and comment in their native language and need to know if there is a way to have those posts and comments translated to the language of the visitor. For example on the page included there are people commenting in english and polish. When I visit the page I hope to see the polish translated to english. So far I do not. However, when I visit the page setting polish as my language it will translate all the english to polish.

The page I need help with: [log in to see the link]