Authorizes the user with email and password. In the body you will find the session token.
@param email The email of the user
@param password The password of the user
@returns If it was successful, it will provide the session token in the body. Save it somewhere safe on the client.
Adds a new user to the authentication system.
@param email The new email
@param password The new password
@param language A two letter language code (ex. de, en)
@returns A Response instance, if the request has been finished completed