The option disappeared last week. I found out via Karen Blakeman http://www.rba.co.uk/wordpress/2013/05/17/google-drops-translated-foreign-pages/
She writes, " There was no announcement from Google, which is not unusual, and it was not until a question about it was posted in a Google Groups forum that someone from Google said they would investigate. The answer they came back with does not bode well:
“This feature is currently unavailable, but we’d like to bring the functionality back in the future. I’ll give you updates as I receive them, but for now there’s no time frame for when that will happen.”Until then:
1. Use Google Translate (http://translate.google.com/) to translate your search into the required language.
2. Copy the translated search and paste it into Google search.
Karen also says .. If you are using Google Chrome and have enabled the translate option under advanced search settings Chrome will offer to translate the page of results for you.