I have found a link from a 2008 blog, but this fails now
2 Answers
Would this would be of any use to you?
http://www.yoda.arachsys.com/siedler/siedler_espanol.pdf
Failing that, this looks pretty thorough:
http://boardgamegeek.com/filepage/30216/catan-todo-en-uno-reglas-y-mapas-para-todas-las-ve