wcs: initialize publisher language and substitution variables (#60908)

wcs/imio_import_directory.py

@@ -28,6 +28,8 @@ class Cmd(Command):
         publisher.WcsPublisher.configure(self.config)
         publisher = publisher.WcsPublisher.create_publisher(register_tld_names=False)
         publisher.set_tenant_by_hostname(sub_options.domain)
+        publisher.install_lang()
+        publisher.substitutions.feed(publisher)
         self.directory = args[0]
         self.import_categories()
         self.import_datasources()