HG-515 Fix trackClick action for components

This “bug” was caused by a recent EmberJS upgrade. However, the “bug”
is actually not a bug but a hack on our side. See this link for more
information:
https://github.com/emberjs/ember.js/issues/9541

Actions referenced in components need to be handled by the component,
and will no longer “bubble up” to be handled by the parent
component/controller/route.
I left the trackClick action on line 103 in ApplicationRoute.ts because it is still used by other templates, such as article.hbs, which do not have a direct component. This was a quick fix on my part, so if we want to avoid code duplication (and yes, we should), we'll need to optimize the code to have only one trackClick action later on.