Jonathan Cardoso a4bc8edd50 captions: TTML export writes the track language, import keeps it (#4025) (#4038) ...

TTML and DFXP exports always wrote xml:lang="en", whatever the caption
track's language. The document now carries the language: export takes
the track's, TTML import reads xml:lang (a language tag of at most 35
characters, else a warning), and captions.import takes an optional
language that wins over both.

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..

main.rs

captions: TTML export writes the track language, import keeps it (#4025) (#4038)

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roundtrip.rs

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ttml_body_timing.rs

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ttml_clock_overflow.rs

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ttml_language.rs

captions: TTML export writes the track language, import keeps it (#4025) (#4038)

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ttml_speakers.rs

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