specified language not defined on this system

  Explanation:  You entered the SET LANGUAGE  statement,  but  the
  logical name table LNM$LANGUAGE_xxx does not exist.

  User  Action:   Contact  your  system  manager  to   make   sure
  everything  has  been  set  up properly; the language may not be
  supported, or the language may have  been  spelled  incorrectly.
  The language name cannot be abbreviated.