All credit for that translation goes to Matías Herrero. He is the one who taught A-Eye how to speak Spanish for which I'm truly grateful.
Also I don't want to make any promises, I'm just curious: Would you like Press Any Button to be translated to other languages?
Since there are no options or settings in the game, you will have to uninstall it and install it again to play in Spanish. Before installation, Steam will suggest that you select your language (and if your Steam interface is in Spanish, the game will probably be installed in that language by default).
All the best,
Eugene Zubko