Added Serbian translation

git-svn-id: https://plugins.svn.wordpress.org/album-cover-finder/trunk@961744 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated version number

git-svn-id: https://plugins.svn.wordpress.org/album-cover-finder/trunk@961748 b8457f37-d9ea-0310-8a92-e5e31aec5664