A Spanish language pack can be downloaded from Netlabs FTP. The installation is easy: just unzip it into the home directory of DSSaver, and you're done!
The language pack contains the Spanish resources for the screen saver and all the currently available modules.
(Thanks to Guillermo for the translation!)
Url: ftp://ftp.netlabs.org/pub/dssaver/dssaver_v15_SpanishPack.zip
Source: