How to translate received data via Ajax?

Question

JavaScript

Good day.
I am receiving data via Ajax in English , how can I display the data translated into another language ?
Do a normal switch

switch (key) {
    case first:
        name = 'первый'
        break;
    case second:
        name: = 'второй'
        break;
    default:
        break;
}

or
is there a better way?

Answer 1

make a dictionary and take values ​​from it

var MESSAGES_RU = {
 'error': "ошибка",
 'done': "готово"
}

Answer 2

without highlighting the key from the translator through ajax in any way