I'm working on a fairly large site, which has multilingual options, but not correctly implemented:
Currently:
- www.example.com/this-is-a-url-of-a-certain-page
- www.example.com/this-is-the-same-url-but-in-a-different-language
Looking into doing this instead:
- www.example.com/en/this-is-a-url-in-a-certain-page
- www.example.com/fr/this-is-the-same-url-but-in-different-language
I came up with this structure by doing some best practices research on SEOmoz etc. - now my question is, will this have an effect on our rankings and how immediate will the effect be (probably after google has re-crawled the page).
Are there any case studies you know of where a person/company changed the url structure and had good results?

