You actually don't need foreign languages. Just remember, google has it's translate feature so they pretty much know what an article is about no matter the language. You can use english articles, add the link to your foreign language site and this will work. I tried it, i constantly rank german and french sites with links from english websites. The main thing you should watch out for is the content of the sites were you're going to post the links - i noticed that sites with good articles (readable, created by humans) provide far more link juice than sites with unreadable, spun crappy content.