Replaces game risk levels (aka difficulties) names to made them look like PD:TH names.

What changed:

Normal -> Easy
Hard -> Normal
Very Hard -> Hard
Overkill -> Very Hard
Mayhem -> Overkill
Death Wish -> Overkill 145+
Death Sentence -> Overkill 193+ (difficulty from DAHM/DORHUD mod for PDTH)

shows up in briefing dialog, in crime net when hovering mouse at lobbies, and in discord rpc