We use i18n.languages in the app-shell to see which languages are available
but this only contains a list of languages it will search in (means, currently
set language, default one and all fallbacks).

We can just set all languages we know as last fallback, so i18n.languages
always contains all languages.

A bit hacky...

In case the current state is the default one we don't redirect.
This gets rid of the initial redirect/histroy entry when loading the page.

If the current state can't be used to generate a path just fall back
to the current path

It was using the click event but never removed the event listener

Use a dbp-rpovider in the app shell to use the attributes auth, requested-login-status and analytics-event only locally

Allow globally overriding slots in the light dom of components and use it to override the auth-info slot in the Nextcloud file picker

They can in theory be arbitrary strings, so don't try to convert them
to a number.

Fixes #52