This is a second try to provide a default implementation of localReplace that can be
overridden using the extension method.

I define __localReplace(message) in TemplatingUtils.

In __getattr__ I look up the name in self.client.instance.templating_utils. If it is not
found, check to see if the name is 'localReplace'. If so, return self.__localReplace.

This allows a fallback for _localReplace so we can add it in the right places in the templates.
But it doesn't support overriding existing TemplatingUtils methods.

See: add_localReplace_to_all_templates2.diff