Returns a list of all assigned Mastery Profiles for a specified User. If a User has no assigned Mastery Profiles, an empty array is returned. Each Mastery Profile returned will contain the profile Id, identifier, the Id of the associated image, and the content of the Mastery Profile. The Mastery Profile content returned will be in the User's preferred language. If the Mastery Profile does not contain content in the User's preferred, the next available language will be provided.