ui: Add hotkey (F12) to reset UI and log page name

In the old UI pressing F12 lead to resetting the UI. This is now also
possible with the new UI.
Additionally the name of the currently shown page is logged to the
logfiles.

Change-Id: I35c61a7fdcb5de692ed6d1e8dc0a99e4cbfe5d74
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=991267
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>