Well, here you go :
https://help.eset.com/efsw/7.0/en-US/silent_installation.html
There's a link to the different language codes as well. BTW, I tried with the french "fr-FR" language codes, and no luck, the program still installs itself in english, not that I mind that much, though, but I'd like to know what I'm doing wrong.
Maybe my syntax...it looks like a "comma or not comma" kind of thing.
Have a nice day,
Thierry