Feature/multilingual metadata

[oscarssanchez]

Description of the Change

This supports a feature from Brightcove Studio called "Multilingual metadata".

Per Brightcove documentation https://apis.support.brightcove.com/cms/references/reference.html#operation/GetVideoVariant, we are only supporting at this point the following metadata update:

• Name
• Long Description
• Short Description
• Meta fields (they will not be updatable, but will be updated, meaning they will not be lost when updating the overall metadata if they have been set in Studio, as Meta fields are not yet supported by the connector)

The connector should have a new select option to switch between variants and allow the user to update them, similar to how they are updatable (but not creatable) from the video edit page from Brightcove Studio.

Closes #

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Verification Process

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

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Props @