Some websites try to hack Google by mixing languages. They put in content labelled as one language / encoding, but mix in content of another language.
Here is one example:
The interesting part is this page not visible. If you go to that URL in a browser, you get forwarded to the main website, rostislaw.com
But Google treats it as a separate page.
So by submitting all these "fake pages" to Google, which all link back to your website, you got backlinks. And they APPEAR to be unique content. Google use the first word to guess the language and in this case it's Malay. So it thinks the page is Malay when it is actually in Russian.