Leaflet.i18n.js

// Following https://github.com/Leaflet/Leaflet/blob/master/PLUGIN-GUIDE.md
(function (factory, window) {

    // define an AMD module that relies on 'leaflet'
    if (typeof define === 'function' && define.amd) {
        define(['leaflet'], factory);

        // define a Common JS module that relies on 'leaflet'
    } else if (typeof exports === 'object') {
        module.exports = factory(require('leaflet'));
    }

    // attach your plugin to the global 'L' variable
    if (typeof window !== 'undefined' && window.L) {
        factory(window.L);

    }
}(function (L) {
    L.locales = {};
    L.locale = null;
    L.registerLocale = function registerLocale(code, locale) {
        L.locales[code] = L.Util.extend({}, L.locales[code], locale);
    };
    L.setLocale = function setLocale(code) {
        L.locale = code;
    };
    return L.i18n = L._ = function translate(string, data) {
        if (L.locale && L.locales[L.locale] && typeof L.locales[L.locale][string] !== "undefined") {
            string = L.locales[L.locale][string];
        }
        try {
            // Do not fail if some data is missing
            // a bad translation should not break the app
            string = L.Util.template(string, data);
        }
        catch (err) {/*pass*/
        }

        return string;
    };
}, window));