Title sorting descending

[Melanie-Koller]

The title sorting descending is not working properly.

[Arnei]

The issue here is that capitalized and non-capitalized titles are grouped, i.e. first all non-capitalized titles, then all capitalized titles. Iirc this is an old issue with how ElasticSearch in the backend handles sorting, anyone looking to fix this should check there first.

[mtneug]

This is probably related opencast/opencast#5413.

[Arnei]

Closing this as a duplicate #853 (Yes, this was open first, I know)