navigator7: Where should I override handleInvalidUri(String message)?

I’m using the navigator7 add-on and have created an application based on the example app in the source.

My question is where should I override org.vaadin.navigator7.Navigator#handleInvalidUri(String message) ??

I’d like to do this to correct the grammatical error in the default string (possibly localize it) and to add some form of logging to track these.

Anyone got suggestions?

Thanks in advance