The version of ROM loaded on your phone is only for English locale. You will need to either contact your provider, or obtain a Spanish ROM and re-flash your phone.
Re-flashing your ROM will void the warranty, and is grounds for fines on certain carriers. Please check with your provider/carrier first before attempting this method.
Also, Flashing can cause the device to become permanently defective.
As far as information for directly solving your problem, I have flashed my T-Mobile Dash so that it runs on an Original S620 ROM, obtained through the internet. The version of ROM that I was able to obtain only has English and French. However, you may be able to find better information and the files you need from the site below.
http://www.modaco.com/
http://www.youtube.com/watch?v=i_BuN68vclM
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