The Google application on my iOS device allows me to search both in English and in foreign languages, at the same time. In other words, I just start speaking, and it will recognize the language.
It seems that Google Voice Search with www.google.com via a desktop web browser (like Chrome on OS X), does not in the default setting allow multiple languages at the same time.
Is there a language setting somewhere, where I can add my language to the list of languages to parse when voice searching?
NB: Interestingly, the mobile Google app is the only Google application that I have found that can take multiple language inputs. The mobile Chrome app on iOS, does not.