i18next在客户端实现站点的本地化

i18next 在客户端实现站点的本地化，i18next 从服务端获取资源然后对标签为data-i18n 的内容进行翻译。

示例：

// given loaded and merged dictionaries in i18next.js to:
{
    "en_US": {
        "ns.special": {
            "app": {
                "name": "i18n",
                "insert": "you are __youAre__",
                "child": "__count__ child",
                "child_plural": "__count__ children"
            }
        },
        "ns.common": {}
    },
    "en": {
        "ns.special": {
            "app": {
                "area": "Area 51"
            }
        },
        "ns.common": {}
    },
    "dev": {
        "ns.common": {
            "app": {
                "company": {
                    "name": "my company"
                }
            },
            "add": "add"
        },
        "ns.special": {
            "nav": {
                "1": "link1",
                "2": "link2",
                "home": "home"
            }
        }
    }
}