Squashed commit of the following:

commit 21309f2c
Merge: f69672e8 7a2e492e
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 14:16:56 2022 +0200

    Merge branch 'master' into dbp-translation-component

commit f69672e8
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:48:10 2022 +0200

    Remove unnecessary en translation text

commit 6d0df984
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:36:45 2022 +0200

    Remove unnecessary imports and minor refactor

commit 6496d910
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:24:51 2022 +0200

    Add lang-File attribute to README

commit 7a528144
Author: Manuel Kocher <manuel.kocher@tugraz.at>
Date:   Thu May 12 13:17:40 2022 +0200

    Add dbp-translation component and include it in showcase

In case the path ending with the activity ID has more trailing path elements, we don't fall
back to the default route but just ignore them (and save them in the router state).

This allows passing in extra information via the path without breaking the routing,
and in case we want to forward the routing to the activities in the future we can use
the extra path elements we store for that.

For this to work with our current logic we have to stop comparing path strings and compare
the resulting computed state everywhere instead.

Up until now it would throw and never set a login status. This would lead
to the login process never completing, and in our case the app-shell
would never show the app and only show a white page.

Instead set the status to logged out and show a notification.

Not just when we aren't logged in. To avoid layout shifts.

This was used to create HTML elements for a shadow dom, but this
is now provided by the scoped-elements mixin via this.createScopedElement().

One way to handle this is enough, so remove this again.
All users have been ported already.