text: 
  CREATE OR REPLACE FUNCTION d_language_name(
      lang_name_id BIGINT
  )
  
  RETURNS BIGINT
  
  LANGUAGE PLPGSQL
  VOLATILE
  CALLED ON NULL INPUT
  PARALLEL UNSAFE
  
  AS $$
  
  BEGIN
  
      DELETE FROM t_language_names
      WHERE tln_id = lang_name_id;
  
      RETURN lang_name_id;
  
  END;
  
  $$;
  