Changes to Download video captions

added the new edit_conflict enum value to the error response property for the response status 400

added the new edit_conflict enum value to the error response property for the response status 401

added the new edit_conflict enum value to the error response property for the response status 403

added the new edit_conflict enum value to the error response property for the response status 404

added the new edit_conflict enum value to the error response property for the response status 409

added the new edit_conflict enum value to the error response property for the response status 429

added the new edit_conflict enum value to the error response property for the response status 500

added the new edit_conflict enum value to the error response property for the response status 501

added the new edit_conflict enum value to the error response property for the response status 503

added the new optional query request parameter lang

added the new conflict enum value to the error response property for the response status 400

added the new conflict enum value to the error response property for the response status 401

added the new conflict enum value to the error response property for the response status 403

added the new conflict enum value to the error response property for the response status 404

added the new conflict enum value to the error response property for the response status 429

added the new conflict enum value to the error response property for the response status 500

added the new conflict enum value to the error response property for the response status 501

added the new unavailable enum value to the error response property for the response status 400

added the new unavailable enum value to the error response property for the response status 401

added the new unavailable enum value to the error response property for the response status 403

added the new unavailable enum value to the error response property for the response status 404

added the new unavailable enum value to the error response property for the response status 429

added the new unavailable enum value to the error response property for the response status 500

added the new unavailable enum value to the error response property for the response status 501

added the non-success response with the status 409

added the non-success response with the status 503