Adding Spanish T9 to W508

I would like to add the spanish dictionary to my W508 so I can use T9 when texting. I bought this phone in the US from Amazon and I'm really happy with it. Phone is unlocked.

Any of the flashing programs (SE Tool Lite, XS, Far Manager?)would let me do this without affecting other things? Which file/firmware or package would I need to use to accomplish this?

Thanks so much!