Note: you are viewing the development version of schema.org. See How we work for more details.

subtitleLanguage

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > subtitleLanguage

Languages in which subtitles/captions are available, in IETF BCP 47 standard format.
Values expected to be one of these types
Language
Text
Used on these types
BroadcastEvent
Movie
ScreeningEvent
TVEpisode

Source

https://github.com/schemaorg/schemaorg/issues/2110