How non-superuser can restore database containing procedures

["Andrus" <kobruleht2@xxxxxx>]

I need to allow non-superusers to create and restore databases containing
plpgsql language procedures.
template0 and template1 do not have any languages installed.

During restore they receive error:

pg_restore: [archiver (db)] could not execute query: ERROR:  must be
superuser to create procedural language
    Command was: CREATE PROCEDURAL LANGUAGE plpgsql;

How to allow non-superusres to create database with language ?

Andrus.