update Spanish translation:

 * manual/bind.xml.es, manual/custom-error.xml.es: New translations
 * manual/style/lang/es.xml: text snippet updates

Submitted by: Jesus Blanco <blanco bitrock.com>
Reviewed by: Daniel Lopez


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@125663 13f79535-47bb-0310-9956-ffa450edef68