added Spanish translation
tweaked one German string 

git-svn-id: https://plugins.svn.wordpress.org/p2-header-ad/trunk@819079 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated stable tag, tested up to WordPress 3.8

git-svn-id: https://plugins.svn.wordpress.org/p2-header-ad/trunk@819081 b8457f37-d9ea-0310-8a92-e5e31aec5664