Commit a03f5f4dfbbf885db567c3909241a55eb5869fce
2017-12-28T22:59:29
Replace "ISO 639" with "BCP 47" `hb_language_from_string` accepts not only ISO 639 but also BCP 47. Not all ISO 639 codes are valid BCP 47 tags but the function does not accept overlong language subtags anyway.