100% Bulgarian translation

This is a 3 part pull request. Each of the commits shows which state of git it is 100% against.
The first is against the current git.pot in the git-l10n/git-po
The second is against the updated git.pot (make po/git.pot ) in the git-l10n/git-po
The third is synced with v2.0.4 tag in master upstream.