ALTER LANGUAGE — change the definition of a procedural language
ALTER [ PROCEDURAL ] LANGUAGEnameRENAME TOnew_nameALTER [ PROCEDURAL ] LANGUAGEnameOWNER TO {new_owner| CURRENT_USER | SESSION_USER }
   ALTER LANGUAGE changes the definition of a
   procedural language.  The only functionality is to rename the language or
   assign a new owner.  You must be superuser or owner of the language to
   use ALTER LANGUAGE.
  
nameName of a language
new_nameThe new name of the language
new_ownerThe new owner of the language
   There is no ALTER LANGUAGE statement in the SQL
   standard.