Improve Spanish custom error messages.

Submitted by:   Simó <sim6 cataloniamail.com>
Reviewed by:    Daniel Lopez <daniel rawbyte.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@102002 13f79535-47bb-0310-9956-ffa450edef68