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/i18next-fs-backend/README.md

@@ -0,0 +1,148 @@
+# Introduction
+
+[![Actions](https://github.com/i18next/i18next-fs-backend/workflows/node/badge.svg)](https://github.com/i18next/i18next-fs-backend/actions?query=workflow%3Anode)
+[![Actions deno](https://github.com/i18next/i18next-fs-backend/workflows/deno/badge.svg)](https://github.com/i18next/i18next-fs-backend/actions?query=workflow%3Adeno)
+[![npm version](https://img.shields.io/npm/v/i18next-fs-backend.svg?style=flat-square)](https://www.npmjs.com/package/i18next-fs-backend)
+
+This is an i18next backend to be used in Node.js and Deno. It will load resources from the file system.
+
+It's based on the deprecated [i18next-node-fs-backend](https://github.com/i18next/i18next-node-fs-backend) and can mostly be used as a drop-in replacement.
+
+It will load resources from filesystem. Right now it supports following filetypes:
+
+- .json
+- .json5
+- .jsonc
+- .yml/.yaml
+- .js (very limited, checks for `exports` or `export default`)
+
+# Getting started
+
+```bash
+# npm package
+$ npm install i18next-fs-backend
+```
+
+Wiring up:
+
+```js
+import i18next from 'i18next';
+import Backend from 'i18next-fs-backend';
+
+i18next.use(Backend).init(i18nextOptions);
+```
+
+for Deno:
+
+```js
+import i18next from 'https://deno.land/x/i18next/index.js'
+import Backend from 'https://deno.land/x/i18next_fs_backend/index.js'
+
+i18next.use(Backend).init(i18nextOptions);
+```
+
+- As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.
+
+## Backend Options
+
+```js
+{
+  // path where resources get loaded from, or a function
+  // returning a path:
+  // function(lngs, namespaces) { return customPath; }
+  // the returned path will interpolate lng, ns if provided like giving a static path
+  loadPath: '/locales/{{lng}}/{{ns}}.json',
+
+  // path to post missing resources
+  addPath: '/locales/{{lng}}/{{ns}}.missing.json',
+
+  // if you use i18next-fs-backend as caching layer in combination with i18next-chained-backend, you can optionally set an expiration time
+  // an example on how to use it as cache layer can be found here: https://github.com/i18next/i18next-fs-backend/blob/master/example/caching/app.js
+  // expirationTime: 60 * 60 * 1000
+}
+```
+
+Options can be passed in:
+
+**preferred** - by setting options.backend in i18next.init:
+
+```js
+import i18next from 'i18next';
+import Backend from 'i18next-fs-backend';
+
+i18next.use(Backend).init({
+  backend: options,
+});
+```
+
+on construction:
+
+```js
+import Backend from 'i18next-fs-backend';
+const Backend = new Backend(null, options);
+```
+
+via calling init:
+
+```js
+import Backend from 'i18next-fs-backend';
+const Backend = new Backend();
+Backend.init(null, options);
+```
+
+## TypeScript
+
+To properly type the backend options, you can import the `FsBackendOptions` interface and use it as a generic type parameter to the i18next's `init` method, e.g.:
+
+```ts
+import i18n from 'i18next'
+import FsBackend, { FsBackendOptions } from 'i18next-fs-backend'
+
+i18n
+  .use(FsBackend)
+  .init<FsBackendOptions>({
+    backend: {
+      // fs backend options
+    },
+
+    // other i18next options
+  })
+```
+
+# If set i18next initAsync option to false it will load the files synchronously
+
+```js
+// i18n.js
+const { join } = require('path')
+const { readdirSync, lstatSync } = require('fs')
+const i18next = require('i18next')
+const Backend = require('i18next-fs-backend')
+i18next
+  .use(Backend)
+  .init({
+    // debug: true,
+    initAsync: false,
+    fallbackLng: 'en',
+    lng: 'en',
+    preload: readdirSync(join(__dirname, '../locales')).filter((fileName) => {
+      const joinedPath = join(join(__dirname, '../locales'), fileName)
+      const isDirectory = lstatSync(joinedPath).isDirectory()
+      return isDirectory
+    }),
+    ns: 'backend-app',
+    defaultNS: 'backend-app',
+    backend: {
+      loadPath: join(__dirname, '../locales/{{lng}}/{{ns}}.json')
+    }
+  })
+```
+
+---
+
+<h3 align="center">Gold Sponsors</h3>
+
+<p align="center">
+  <a href="https://locize.com/" target="_blank">
+    <img src="https://raw.githubusercontent.com/i18next/i18next/master/assets/locize_sponsor_240.gif" width="240px">
+  </a>
+</p>