anchor.diff:              - `USER_INSUFFICIENT_PERMISSIONS` if the currently authenticated user has insufficient rights to update the entry (i.e. normal user, but not owner)
   
   + Response 404 (application/json)
  -    + Attributes (object)
  -        + status (string) - Textual description of the HTTP status
  -        + message (string) - Detailed error information, e.g. hint about malformed request
  +    + Attributes (Error Response)
           + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
   
               A comprehensive list of possible errors:
               - `ENTRY_DOES_NOT_EXIST` if the entry specified by the URI does not exist in the database
   
   + Response 406 (application/json)
  -    + Attributes (object)
  -        + status (string) - Textual description of the HTTP status
  -        + message (string) - Detailed error information, e.g. hint about malformed request
  +    + Attributes (Error Response)
           + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
   
               A comprehensive list of possible errors:
  
positive.code:             - `ENTRY_DELETED_SUCCESSFULLY` if the entry has been deleted successfully from the database
  
  + Response 401 (application/json)
      + Attributes (object)
          + status (string) - Textual description of the HTTP status
          + message (string) - Detailed error information, e.g. hint about malformed request
          + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
  
              A comprehensive list of possible errors:
  
negative.code:             - `REQUEST_MALFORMED_DATA` if the submitted data in the request body does not match the Content-Type or is unparseable
  
  + Response 401 (application/json)
      + Attributes (Error Response)
          + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
  
              A comprehensive list of possible errors:
              - `NEED_AUTHENTICATION` if no valid session token has been supplied or the user for whom the token has been created does not exist (anymore)
  
  + Response 406 (application/json)
      + Attributes (Error Response)
          + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
  
              A comprehensive list of possible errors:
              - `REQUEST_UNSUPPORTED_CONTENT_TYPE` if the submitted Content-Type is not `application/json`
  
  + Response 422 (application/json)
      + Attributes (Error Response)
          + i18n (string) - A unique token representing above error description message; can be used for internationalization in frontends
  
              A comprehensive list of possible errors:
  