Well There are Two ways you can do this.

If you have iGoogle Desktop, you can click settings in the top right hand side of the screen. Then click "search settings" from there you can change what language you would like google to use.

If you are just using Google Search from the domain, you can look right beside the search box, it will have language tools. Click this, it will allow you to set the preferred language. Hope this helps.
Source(s):
I use iGoogle Desktop, and Google all the time.

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