php-isocodes
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Language Tag
https://tools.ietf.org/html/rfc5646.html
langtag = language
["-" script]
language = 2*3ALPHA ; shortest ISO 639 code
["-" extlang] ; sometimes followed by
; extended language subtags
/ 4ALPHA ; or reserved for future use
/ 5*8ALPHA ; or registered language subtag
script = 4ALPHA ; ISO 15924 code
pt-BR - português do Brasil