[ietf-languages-announcements] Update to the language subtag registry 2017-06-07

The IANA Services Operator has updated the language subtag registry on 2017-06-07. Please see http://www.iana.org/assignments/language-subtag-registry http://www.iana.org/assignments/lang-subtags-templates Best regards, Sabrina Tanamal IANA Services Specialist PTI