Updated Bulgarian translation.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@803792 b8457f37-d9ea-0310-8a92-e5e31aec5664
Prep for v4.6.2 release.

git-svn-id: https://plugins.svn.wordpress.org/email-users/trunk@803800 b8457f37-d9ea-0310-8a92-e5e31aec5664