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transcriberbin: add support for translations

With this, if the transcriber element in use supports "translation_src_" request source pads, the user can now specify what languages to translate to and how to map them to 608 channels (only CC1 and CC3 are supported).

For instance, translation-languages="languages, CC3=transcript, CC1=fr" will cause the original transcript to be muxed into the CC3 channel, and the French translation to be muxed into the CC1 channel.

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