Merged r11246 from trunk to 2.2-stable (#12926, #12928)

Bulgarian translation for 2.2-stable updated by Ivan Cenov.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.2-stable@11251 e93f8b46-1217-0410-a6f0-8f06a7374b81