Just a small problem in the file "es-ES.com_community.ini" which is under your directory "Site" and is copied to "language\es-ES".
Under the "#register email send" section there is a miss "CC " on the line ACCOUNT DETAILS FOR.
This will result in a problem when the user receives the account authorisation email that will have "CC ACCOUNT DETAILS FOR" as the subject.
Regards and thanks for the translation.