The "Languages" screen registers and changes languages. Registering languages is a typical activity for application developers. See the warning under Application Development. The entry fields are: - "Code": The code that refers to the language. Conforming to the international language codes of ISO 639 is recommended. - "Description": The description of the language. - "Usable In User Interface": When checked, the language can be used in the user interface. ## Database The following fields relate to the database: - "NLS Language": The language setting in the database. It makes database errors appear in the correct language. - "NLS Territory": The region setting in the database. It makes region-dependent settings appear correctly. - "NLS Date Format": The date format of the database. This must always be `dd-mm-rrrr hh24:mi:ss`. Other date formats are not supported.