Bug 35584: Add missing licenses to about page

Bug 35584: Add missing licenses to about page

This patch adds license information to the about page which was missing
for several JavaScript libraries. The patch also makes a minor change to
CSS to improve alignment of content in the licenses tab.

One library, vis-timeline-graph2d.min.js, lacked the correct version
information in the source. This information has been added.

To test, apply the patch and rebuild the staff interface CSS.

- Go to the about page and open the "Licenses" tab.
- Confirm that the information looks correct.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>