Google Voice Search adds three new languages
This allows those who speak other languages than English to tap on the microphone button to initiate a Google Search without having to type in the request. The answer will always be spoken back in the same language that the query was asked in. For example, if you ask how to cook fries in French, you will get the response back in French.
The new languages are available in the updated version of Google Search for Android and for iOS.The only condition is that you have the latest version of the app already installed on your phone. And while Google plans on extending Voice Search to more languages, there was no hint as to which ones might be next, or when the next batch will be added to Google Search.
source: Google via SlashGear