Belarusian vs Byelorussian
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Hope it was fixed with new name like Belarussian not just Belarusian :)
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My bad, "IANA":http://www.iana.org/assignments/language-subtag-registry and "BCP-47":http://tools.ietf.org/html/bcp47 defines it as Belarusian... with only one s...