add target="_blank" to new button

git-svn-id: https://plugins.svn.wordpress.org/easy-media-gallery/trunk@854708 b8457f37-d9ea-0310-8a92-e5e31aec5664
restore missing tags

git-svn-id: https://plugins.svn.wordpress.org/easy-media-gallery/trunk@854709 b8457f37-d9ea-0310-8a92-e5e31aec5664