Create a new i18next instance for every web component

See merge request !67

Try to hack collapsing columns, make modal menu scrollable on mobile phones, add remember me button to nextcloud

chore(deps): lock file maintenance

See merge request !68

It only detects i18n.t by default

We match based on the tag name now and not on the namespace,
so revert this again so it's consistent with the other packages

So we only need to define it in one place.

Instead of using the namespace which is hardcoded we use the tag name that was
used to register the element (or the "real" tag name in case of a scoped element).

This way if AppShell is regsitered as "dbp-some-app" it can still be overriden by
specifying "dbp-some-app" in the overrides object.

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.