these are Bulgarian aliases defined in locale.alias. there is a typo in the UTF-8 alias: bg bg_BG.CP1251 bg_BG bg_BG.CP1251 bg_BG.cp1251 bg_BG.CP1251 bg_BG.microsoftcp1251 bg_BG.CP1251 bg_BG.microsoft-cp1251 bg_BG.CP1251 bg_BG.MICROSOFT-CP1251 bg_BG.CP1251 bg_BG.iso88595 bg_BG.ISO8859-5 bg_BG.ISO-8859-5 bg_BG.ISO8859-5 bg_BG.koi8r bg_BG.KOI8-R be_BG.utf8 be_BG.UTF-8 the last line should be : bg_BG.utf8 bg_BG.UTF-8 (diffs are in the "b[e|g]_BG" part)
fixed in git
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