The feature is now available in the search toolbelt and it's much smarter: Google automatically detects the most appropriate languages for your query. Click on "show options", select "translated search" and Google shows a box that lists some languages, the translations of your query and the top search results for those translated queries.
For example, if you search for [oslo museums], Google shows a list of web pages written in Norwegian. When you search for [romantic art], Google suggests more than one language: Spanish, French, Italian and German.
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"If you're traveling and want to find hotels, restaurants, activities or reviews written from a local perspective, or if you're just curious to find what's being written about a company, product or topic in another language, give Translated search in the Search Options panel a try," suggests Google.