added es_ES translation

git-svn-id: https://plugins.svn.wordpress.org/osclasscom/trunk@929754 b8457f37-d9ea-0310-8a92-e5e31aec5664
removed old translations

git-svn-id: https://plugins.svn.wordpress.org/osclasscom/trunk@929756 b8457f37-d9ea-0310-8a92-e5e31aec5664