mkvmerge, mkvpropedit: added a new command line option called `-enable-legacy-font-mime-types`. all: added a new translation to Chinese Simplified (Singapore) by Dian Li. all: IETF BCP 47/RFC 5646 language tags: Digital Cinema Naming Convention language codes that fall into the IETF BCP 47 range of 'private use' tags (`qaa`–`qtz`) are now replaced by their IETF BCP 47 equivalents during normalization (e.g. all: IETF BCP 47/RFC 5646 language tags: all language codes reserved for private/local use (`qaa`–`qtz`) are now supported. all: IETF BCP 47/RFC 5646 language tags: reduced the maximum number of extended language subtags that are present in a valid tag from 3 to 1 in compliance with RFC 5646 section 2.2.2. all: IETF BCP 47/RFC 5646 language tags: all in the IANA language subtag registry are now supported, even those marked as deprecated and of type 'grandfathered'. all: IETF BCP 47/RFC 5646 language tags: all lists of valid subtags have been updated from their respective authoritative sources. all: IETF BCP 47/RFC 5646 language tags: all deprecated subtags from theIANA language subtag registry are now supported. all: IETF BCP 47/RFC 5646 language tags: grandfathered language tags are now supported. In this example the IETF language element would be set to `yue` and the corresponding legacy element to `chi`.

However, there is an extlang subtag `yue` with a valid prefix of `zh` ('Chinese'), and for 'Chinese' there is an ISO 639-2 language code: `chi`. For example, 'Yue Chinese' = `yue` is not part of ISO 639-2. all: IETF BCP 47/RFC 5646 language tags: when deriving the legacy language element codes to use a language tag's ISO 639 code is also potentially interpreted as an & its prefix is used as the legacy language code.

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