add partially migrated code of feed view
component.network: don't flash the offline box while checking connection status
api.php: add the dummy "onlinecheck" action
api.js: don't rely on the global appstate object being present
component.createaccount: fire login-event first so that the createaccount event subscriber can modify the hash to welcome
i18n: minor ux tweaks in the labels
css: add styling for the offline box
component.menu: show the no-feeds placeholder when not having any feeds
rename component.menu to view.menu (components are not supposed to deal with UI parts!)