Fixed fileset alphanumeric sorting

fixes https://gitlab.ruhr-uni-bochum.de/FDM/rdm-system/antleaf-projectmanagement/-/issues/282. Specifically fixes issue #41 (closed)

added Ready for review label

requested review from @anusha

assigned to @gyangupta10

approved this merge request

removed Ready for review label

added Approved label

changed the description

merged

mentioned in commit 9e80e676