more at: https://github.com/brettz9/i18next/blob/master/release/i18next-1.5.8.js#L438

cookies.js

var cookie = {
    create: function (name, value, minutes) {
        var expires;
        if (minutes) {
            var date = new Date();
            date.setTime(date.getTime() + (minutes * 60 * 1000));
            expires = "; expires=" + date.toGMTString();
        } else expires = "";
        document.cookie = name + "=" + value + expires + "; path=/";
    },

    read: function (name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    },

    remove: function (name) {
        this.create(name, "", -1);
    }
};