<script src="libs/select2-4.0.2-rc.1/dist/js/i18n/<here-goes-language>.js"></script>
The include above was missing as Keving Brown said. As the example quoted in the question the file for spanish would be "es.js"
Additional to @SummerRain's answer, if you have loaded the language file into your page, you can use below way to set the default language for all select2, instead of one by one.
$.fn.select2.defaults.set("language", $.fn.select2.amd.require("select2/i18n/fr"));
select2 uses amd to define its dependencies as you can see from $.fn.select2.amd. "select2/i18n/fr" is the amd module name for the french language definitions.
CDN scripts:
<script src="https://cdn.jsdelivr.net/npm/select2@4.0.13/dist/js/i18n/[culture-name].js"></script>
If you use Webpack, you can set the default language like that (example for french) :
require('select2');
$.fn.select2.amd.define('select2/i18n/fr',[],require("select2/src/js/select2/i18n/fr"));
Add script like this after select2 plugin
$.fn.select2.amd.define('select2/i18n/ru',[],function () {
// Russian
return {
errorLoading: function () {
return 'Результат не может быть загружен.';
},
inputTooLong: function (args) {
var overChars = args.input.length - args.maximum;
var message = 'Пожалуйста, удалите ' + overChars + ' символ';
if (overChars >= 2 && overChars <= 4) {
message += 'а';
} else if (overChars >= 5) {
message += 'ов';
}
return message;
},
inputTooShort: function (args) {
var remainingChars = args.minimum - args.input.length;
var message = 'Пожалуйста, введите ' + remainingChars + ' или более символов';
return message;
},
loadingMore: function () {
return 'Загружаем ещё ресурсы…';
},
maximumSelected: function (args) {
var message = 'Вы можете выбрать ' + args.maximum + ' элемент';
if (args.maximum >= 2 && args.maximum <= 4) {
message += 'а';
} else if (args.maximum >= 5) {
message += 'ов';
}
return message;
},
noResults: function () {
return 'Ничего не найдено';
},
searching: function () {
return 'Поиск…';
}
};
});
set option
$(".js-basic-multiple").select2({
language: "ru"
});