Upload was broken without any error with webdav-client 4.x. This was
hiding the error.

This option doesn't exist in webdav.client 3.x but is required in 4.x
due to https://github.com/perry-mitchell/webdav-client/issues/266

This will switching between versions easier.

These are all transitive dependencies (or unused) so they get pulled in
anyway.

This reverts commit 421d92f3.

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...

Lock file maintenance

See merge request !66

Clean up initial router handling and add a default state

See merge request !65

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