The old admin ui had an integration for
tobira in the series details and new series
modal. This starts porting the integration
by laying out some basic DOM structure
and adding CSS and translations. I.e.
it should already look similar to the old
admin ui, but there is no actual functionality
yet.

Ports basic page functionality. This still
does not do anything useful, since I currently
cannot test with real data to fully understand
how this is supposed to work. But most of the
code from the old admin ui is now here.

Can now actually be used to link new series
to exisiting or new tobira pages, or view linked
pages in the series details.

When creating a new series, notifications
for the tobira tab would not show at all.
This fixes that.

While the user was warned about malformed
input, they were not actually prevented from
submitting it. This hacks our custom
validation into WizardNavigationButtons.tsx
to achieve validation.

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Missed some errors after the last merge, this
should take care of them.

The notification for a server error when fetching
tobira information from Opencast was already
shown on the ACL tab, before the Tobira tab. This
was especially annoying if you had not intention
of using Tobira, as the notification would show up
anyway. This disables the notification and instead
puts some information in the logs. A better, but
currently not easily possible solution would be
to confine the notification to the tobira tab.

The display for the path for a new tobira page
was always one character behind what the user
entered. This fixes that.

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