Dev commit: textdomain and bug fixes.

git-svn-id: https://plugins.svn.wordpress.org/accessible-video-library/trunk@853853 b8457f37-d9ea-0310-8a92-e5e31aec5664
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git-svn-id: https://plugins.svn.wordpress.org/accessible-video-library/trunk@853855 b8457f37-d9ea-0310-8a92-e5e31aec5664