I am not sure what exactly the problem is and which version you use.
Could you please elaborate on the following:
1. Version that you use, you may check it How to check your current Sitefinity version?
2. Do you have problems with Multilingual pages, or you have a problem with multilingual News only?
I suppose that if your localized items lead to 404 errors, you have also translated the News Titles. These titles are forming the URL. If you use characters other than the latin ones, your URLs might not be parsed. The solution here is to define a new meta field as showed in our User Manual, and use this meta field for your News Title, while you keep the original Title feed with latin characters only.
We do not have a company site with multilingual website, but I am sure some of the sites in our Showcase gallery are such. I invite you to check them out.
the Telerik team
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