Halo 3 - is it possible to change the language?

[biggie&2pac]

Ok so I just bought Halo 3 and Halo 3 ODST. The only problem I have is that I bought it in Spain. Is it possible to change the voice, text and subtitle language (to English)? I need to know this because if it is in Spanish I'll sell it to a friend and re buy it in English, if not I'll just keep it.

I want it in English because I do walkthroughs and reviews on YouTube for English speaking people, NOT Spanish..

Please this is very important!!!

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Thank you very much!