Filing cabinet / document collection: Wrong (lexical) sort order for document groups

[jfowl]

I would expect the list to be sorted from 1 to 20, instead of 10 – 20 and then 1 – 9.

Example from https://fragdenstaat.de/dokumente/sammlung/47-bundestag-untersuchungsausschusse-1-bis-20-wahlperiode/:

Might be an issue in https://github.com/okfde/django-filingcabinet, so feel free to move it there.

[stefanw]

Import order is by lexical name, fixed it manually by reordering the directory tree.