Dragokas
https://forums.alliedmods.net/showpost.php?p=2664767&postcount=54

Ernecio
https://forums.alliedmods.net/showpost.php?p=2671251&postcount=56

panxiaohai
https://forums.alliedmods.net/showthread.php?p=1178894

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panxiaohai's version (original version) has a couple of bugs.
Dragokas's version fixes these bugs.

EDSHOT version uses Dragokas's plugin and gamedata* and Ernecio's translations.
EDSHOT version allows to choose particle/sounds at compile time.

gamedata for l4d2: https://forums.alliedmods.net/showthread.php?p=2693455