Changes to * GET /api/v0/exercise-services/client/courses/:id/exercises * * Returns the user's exercise slides for the given course. * Does not return anything for chapters which are not open yet. * Selects slides for exercises with no slide selected yet. * Only returns slides which have tasks whose exercise service can serve this client.

added the optional property items/chapter to the response with the 200 status

added the optional property items/page_url to the response with the 200 status

the response property message became required for the status 401

the response property message became required for the status 403

the response property message became required for the status 404

the response property message became required for the status 426

the response property message_key became required for the status 401

the response property message_key became required for the status 403

the response property message_key became required for the status 404

the response property message_key became required for the status 426

the response property type became required for the status 401

the response property type became required for the status 403

the response property type became required for the status 404

the response property type became required for the status 426