back out r12441

It is not compatible with Ruby 1.8.7.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012443
Fixed slow SELECT ... FOR UPDATE query when deleting an issue.

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012445
Bulgarian translation updated by Ivan Cenov (#15755)

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012446