On the Yandex website I got the API KEY. According to the instructions, I didn’t understand what I read ..
here is the function
https://translate.yandex.net/api/v1.5/tr.json/getLangs ? key=<API-ключ> & [ui=<код языка>] & [callback=<имя callback-функции>] which I don’t know .. how to use the KEY YANDEX API on a regular site using a regular script or JQUERY ?