How to change ERR language?

[PonyExpress]

I'm not sure about steam-tradeoffer-manager, maybe my problem is related to steam-user.

I always received the text of errors (ERR) in English. But after launching a third-party program, now i get them in another language.

 

let client = new SteamUser(),
    manager = new TradeOfferManager({
        "steam": client,
        "language": "en"
    }),
    community = new SteamCommunity();
//...
let t = manager.createOffer(SID);
    t.getUserDetails((ERR, ME, THEM) => {
        if (ERR) {
            console.log("cant trade: " + ERR); // <<< not in English
        } else if (ME.escrowDays == 0 && THEM.escrowDays == 0) {
            console.log("all good");
        } else {
            console.log("escrowDays");
        }
   });

How can I return the language to English? (Global)

And can I get errors in a specific language if need?

 

[Dr. McKay]

The error language is probably controlled by your Steam account language.

[PonyExpress]

Thank you very much.

 

Although it was a bit strange for me to see messages not in English only after a year of use.

[Dr. McKay]

All my modules do send a cookie requesting English text, but I guess it's not always respected.