Diff Names:

Normal - Very Easy
Hard - Easy
Very Hard - Normal
Overkill - Medium
Mayhem - Hard
DeathWish - Very Hard
Death Sentence - Overkill

Descriptions:

Normal - For players who are just learning FPS Games.
Hard - For players new to PAYDAY.
Very Hard - For players who have some experience with PAYDAY.
Overkill - For players who have learned many mechanics of PAYDAY.
Mayhem - For players who want a new challenge.
DeathWish - For players who want a crushing experience.
Death Sentence - For the masters of PAYDAY, the weak will be destroyed.

Added on mod_overrides :)