ALTER LANGUAGE — change the definition of a procedural language
ALTER [ PROCEDURAL ] LANGUAGEname
RENAME TOnew_name
ALTER [ PROCEDURAL ] LANGUAGEname
OWNER TOnew_owner
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.