Included Serbian translation

git-svn-id: https://plugins.svn.wordpress.org/redirect-list/trunk@1036811 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added POT file

git-svn-id: https://plugins.svn.wordpress.org/redirect-list/trunk@1036816 b8457f37-d9ea-0310-8a92-e5e31aec5664