Update languages in readme.txt

git-svn-id: https://plugins.svn.wordpress.org/am-events/trunk@883455 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix typo

git-svn-id: https://plugins.svn.wordpress.org/am-events/trunk@883456 b8457f37-d9ea-0310-8a92-e5e31aec5664