I think we've more or less addressed this issue in an Aikau GitHub issue, but you effectively need to extend the widget and define a custom properties file (then you can override whatever labels you want to), then swap out the default SitesMenu with your custom version (all other functionality will remain the same). SurfBug is designed to work with Surf Components, it won't work with Aikau widgets, there is a "Developer View" option in the Debug menu in Share that you can use to reveal all the Aikau widgets on a page.