Add language file for the TinyMCE plugin

git-svn-id: https://plugins.svn.wordpress.org/post-attached-media-downloads/trunk@962970 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fix an intentional typo in the language file used for testing

git-svn-id: https://plugins.svn.wordpress.org/post-attached-media-downloads/trunk@962972 b8457f37-d9ea-0310-8a92-e5e31aec5664