serbian translation

git-svn-id: https://plugins.svn.wordpress.org/feed-reading-blogroll/trunk@787465 b8457f37-d9ea-0310-8a92-e5e31aec5664
removed error-alert

git-svn-id: https://plugins.svn.wordpress.org/feed-reading-blogroll/trunk@787470 b8457f37-d9ea-0310-8a92-e5e31aec5664
changed version to 1.5.9.2

git-svn-id: https://plugins.svn.wordpress.org/feed-reading-blogroll/trunk@787477 b8457f37-d9ea-0310-8a92-e5e31aec5664