This is mostly a machine (and partial) translation so don't expect much from it.
If you know how to translate what's still in russian, please share at moddb.
Feel free to contribute to the github repository aswell.
Github :
Github.com
Put ALL content from archive in game ROOT folder, not in gamedata
Overwrite files when prompted
Don't use the old translation, just this one
In launcher, select RUSSIAN language to get ENGLISH
( russian language is overwritten by translation )
Good hunting Stalker
update :
Github.com