When running the update function on 0.5.5, the success message is not set

[benlk]

You know, this is probably because we changed some selectors as a result of #1299 and didn't update them in https://github.com/INN/Largo/blob/master/js/update-page.js#L23

Clicking the button triggers the request to the action largo_ajax_update_database ; the response {"status":"Thank you -- the update is complete.","success":true} is received. But the button and success message are not otherwise posted.