Doing an api call when authority control loads (on page views) for getting properties is probably not very good performance-wise.
It would be nice if the list of properties could be maybe be available as it's own resource loader module, which gets cached, or some other solution.
(maybe just go back to maintaining this as json, stored on some page in the MediaWiki ns. This could be maintained by bot. such page would get cached in the same way as other resource loader stuff)
ultimately, wikibase should support the functionality of authority control, adding the links server-side during rendering.