Updated Spanish Translations

Hi.

Just to let you know that I added the folowing spanish translations:

http://docs.webplatform.org/wiki/dom/es
http://docs.webplatform.org/wiki/svg/es

Additionaly, I translated the Webplatform Home page and the code is
available here:

https://github.com/nestorrojas/webplatform-docs-es/blob/master/home.html

How homepage translations will be managed?