fix issue with api-endpoints

There is an issue with the api-endpoints.

• The sorting of newest movies doesn´t work.
• Get movies by director only works when entering the full exact name of the director.
• When creating a review the user is able to create more than one review per movie, which is okay, but he shouldn´t be able to give more than one rating per movie.
• There is a problem when trying to add more than one favorite movie to profile.