Fix api urls
I did this MR first in the UFZ Repo, so that Martin can tell if is ok or not:
https://git.ufz.de/rdm-software/svm/frontend/-/merge_requests/27
It remains WIP until there is feedback by the ufz.
I would say, lets merge it.
Also contains changes from !22 (merged), so it would be better to merge this here after !22 (merged).
Edited by Nils Brinckmann