update Spanish translation

 * manual/install.xml.es: Update to current English version
 * manual/mod/mpm_common.xml.es: New translation

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


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@148906 13f79535-47bb-0310-9956-ffa450edef68