Kartu,
While I hope you develop the translation into Spanish, I have translated the PRS+ v1.0RC to Spanish (and Catalan) and combined with the localization of the previous hacks. Now I have all the firmware with the PRS+ in Spanish. This tested and works perfectly. Here I put links to files and a guide to install the PRS+ in Spanish.
Files (v.1.0RC2):
http://rapidshare.com/files/35114502...S-CAT-epub.zip
or:
http://www.4shared.com/file/22290684...-CAT-epub.html
Instalation guide (spanish):
http://prs-505.webcindario.com/manua...B%20ES-CAT.pdf
If you want, place it on the project page, I do not know how to do .