isso/isso/js/app/config.js

define(function() {
    "use strict";

    var config = {
        "css": true,
        "lang": (navigator.language || navigator.userLanguage).split("-")[0],
        "reply-to-self": false
    };

    var js = document.getElementsByTagName("script");

    for (var i = 0; i < js.length; i++) {
        [].forEach.call(js[i].attributes, function(attr) {
            if (/^data-isso-/.test(attr.name)) {
                try {
                    config[attr.name.substring(10)] = JSON.parse(attr.value);
                } catch (ex) {
                    config[attr.name.substring(10)] = attr.value;
                }
            }
        });
    }

    return config;

});