lucy24 - 8:02 pm on Jun 12, 2013 (gmt 0)
I don't see how the language settings on my website would affect Google's (or Bing's) search results.
Not your OWN website language! The languages of the other sites that come up in search. The search engine doesn't necesssarily know what language a page is in.
If you look at the results from the specific search you posted, you'll notice that the search term itself is in Roman script even when the rest of the page is Cyrillic. Simplest explanation: the brand name is more popular in Russian-speaking parts of the world. Hm. Sounds like something you might want to capitalize on. How are you doing in Yandex?
Granted: Showing results that don't fit constraints which you explicitly gave the search engine, like language or region, is weird. It seems no different from offering pages from 2008 when you've selected "past month".
But "Accept-Language" is inclusive, rather than exclusive. It doesn't mean "send ONLY pages in these languages"; it means "if the page comes in more than one language, these are my preferences".