Add internationalization support with astro-i18next integration

- Implemented astro-i18next for multi-language support, including English, Dutch, and Italian.
- Configured default locale and language fallback settings.
- Defined routes for localized content in the configuration.
- Updated package.json and package-lock.json to include new dependencies for i18next and related plugins.

node_modules/iso-639-1/.eslintrc

@@ -0,0 +1,38 @@
+{
+  // 基于 airbnb 规则
+  "extends": "airbnb",
+  // 使用 babel 解析器，支持一些还没有进入 ES6+ 标准的特性。比如 class property
+  "parser": "babel-eslint",
+  // 解析 webpack alias 中的模块名
+  "settings": {
+    "import/resolver": "webpack"
+  },
+  "env": {
+    "browser": true
+  },
+  "rules": {
+    "no-plusplus": [
+      "error",
+      {
+        // 允许 for 循环中的 i++
+        "allowForLoopAfterthoughts": true
+      }
+    ],
+    "no-param-reassign": [
+      "error", 
+      { 
+        // 允许修改参数的属性
+        "props": false 
+      }
+    ],
+    // 允许在循环里使用 await
+    "no-await-in-loop": 0,
+    // 允许在一个表达式里使用多种操作符，否则与 prettier 冲突
+    // see https://github.com/prettier/eslint-config-prettier#no-mixed-operators
+    "no-mixed-operators": 0,
+    // 允许在 jsx 中使用 bind
+    "react/jsx-no-bind": 0,
+    // 允许所有类型的 proptype
+    "react/forbid-prop-types": 0
+  }
+}