l10n: bg.po: Updated Bulgarian translation (5819t)

[alshopov]

No description provided.

[github-actions]

Warnings found by git-po-helper in workflow #981:

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INFO [po/bg.po@1c3c7b1]	5819 translated messages. 
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WARNING [po/bg.po@1c3c7b1]	mismatched patterns: git pack-objects 
WARNING [po/bg.po@1c3c7b1]	>> msgid: Could not spawn pack-objects 
WARNING [po/bg.po@1c3c7b1]	>> msgstr: Командата „git pack-objects“ не може да се стартира 
WARNING [po/bg.po@1c3c7b1]                           
INFO checking commits: 1 passed.                  
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INFO downloading pot file from https://github.com/git-l10n/pot-changes/raw/pot/master/po/git.pot 

[alshopov]

@jiangxin Please merge
git-l10n/git-po-helper#22