Bug 33736: Don't allow sorting on Location

Bug 33736: Don't allow sorting on Location

We need some special handling to sort on Location as it's got both a
custom renderer and relies on _strings so the ordering and search won't
return expected results without some custom function building.

Sponsored-by: PTFS Europe Ltd
Signed-off-by: Esther Melander <esther@bywatersolutions.com>
Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>