[Misiur]

In "request goes" you have some weird string with a lot of %'s? You only have to urlencode parameters

pawn Код:

SendTranslatedMessage(playerid,message[])
{
    new buf[1024];
    format(buf,sizeof(buf),"translate.yandex.net/tr.json/translate?lang=en-ru&text=%s",urlencode(message));
    printf("Request goes: %s",buf);
     HTTP(playerid, HTTP_GET, buf, "", "MyHttpResponse");
}