Thank you Lynne, I found one and will post it here if you don't mind.
This is a provisional Spanish package from the guys of
www.vbsoporte.com
It is provisional in the sense that is not 100% translate and they have released so we, the spanish speaking forums, can test it on our sites.
They are still working hard to have a much finished product but I will installed on my site and give it a shot. I hope that will be at least a first step and we can allways translate some stuff ourselves from the Control Panel.
Click here to download the Spanish package
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I guessing this should be under 4.0