added spanish language

git-svn-id: https://plugins.svn.wordpress.org/amr-ical-events-list/trunk@885559 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated readme.txt to mention spanish

git-svn-id: https://plugins.svn.wordpress.org/amr-ical-events-list/trunk@885561 b8457f37-d9ea-0310-8a92-e5e31aec5664