Language orientation in Google Blog

When you publish in several languages on your blog, it seems that Google notices that. But today I noticed that there seem to be some glitches within the algorithm. This page had an ad in German but with the Greek footnote "Ads by Google". What does that tell us about their way of sorting it out? First they seem to be separate, the content and the footnote. Probably a more general language detection mode finds Greek letters and translates itself into Greek. And then the place of origin, of publication (Germany) determines the content language? Would be interesting to test? Has anyone got further insight or knowledge on that?