[ietf-languages-announcements] Update to Language Subtag Registry

[Sabrina Tanamal]

IANA has added variant subtag “blasl” to the language subtag registry. Please see

https://www.iana.org/assignments/language-subtag-registry

https://www.iana.org/assignments/lang-subtags-templates

Best regards,

Sabrina Tanamal
Lead IANA Services Specialist
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