Cds-dojson

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- Remove the DOI from the required fields

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- Addition of internal_* and Press fields.
- Fix language ISO 639-2 vs 639-3 mix on DoJSON translations.

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- Addition of default language for videos (English)

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- Videos release candidate.
- New ignore fields: 962__n, 852__j, 778, 981__a.
- New 'audio_characteristics' field.
- Addition of new languages: Ukrainian, Turkish, etc.
- Ignore older video presets.
- Ignore contributor field, if there is no $a subfield.
- Fix translation of unicode roles.
- Fix one contributor several roles.

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