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/readme.md

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+# ISO-639-1
+[![NPM Version][npm-image]][npm-url]
+[![Build Status][travis-image]][travis-url]
+[![Download Count][download-url]][npm-url]
+
+[travis-image]: https://travis-ci.org/meikidd/iso-639-1.svg?branch=master
+[travis-url]: https://travis-ci.org/meikidd/iso-639-1
+[npm-image]: https://img.shields.io/npm/v/iso-639-1.svg?style=flat-square
+[npm-url]: https://npmjs.org/package/iso-639-1
+[download-url]: https://img.shields.io/npm/dt/iso-639-1.svg?style=flat-square
+
+
+Simple interface for [ISO-639-1](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) language codes
+
+## Installation
+
+```
+npm install iso-639-1
+```
+
+## Usage
+
+### Node.js
+
+```javascript
+const ISO6391 = require('iso-639-1');
+console.log(ISO6391.getName('en')); // 'English'
+```
+
+### ES Module
+
+```javascript
+import ISO6391 from 'iso-639-1';
+console.log(ISO6391.getName('en')); // 'English'
+```
+
+### Browsers
+
+HTML
+
+```html
+<script type="text/javascript" src="./node_modules/iso-639-1/build/index.js"></script>
+```
+
+Visit global variable ISO6391 in js
+
+```javascript
+console.log(ISO6391.getName('en')); // 'English'
+```
+
+## Methods
+
+### getName(code)
+  - @param code {string}
+  - @return {string}
+
+Lookup language english name by code
+
+### getAllNames()
+  - @return {array}
+
+Get array of all language english names
+
+### getNativeName(code)
+  - @param code {string}
+  - @return {string}
+
+Lookup language native name by code
+
+### getAllNativeNames()
+  - @return {array}
+
+Get array of all language native names
+
+
+### getCode(name)
+  - @param name {string}
+  - @return {string}
+
+Lookup code by english name or native name
+
+### getAllCodes()
+  - @return {array}
+
+Get array of all codes
+
+### validate(code)
+  - @param code {string}
+  - @return {boolean}
+
+Check whether the given code is in the list of [ISO-639-1](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes)
+
+### getLanguages(codes)
+  - @param codes {array}
+  - @return {array}
+
+Get the array of the language objects by the given codes
+
+## Example
+
+```
+const ISO6391 = require('iso-639-1')
+
+console.log(ISO6391.getName('zh')) // 'Chinese'
+console.log(ISO6391.getNativeName('zh')) // '中文'
+
+console.log(ISO6391.getAllNames()) // ['Afar','Abkhaz', ... ,'Zulu']
+console.log(ISO6391.getAllNativeNames()) //['Afaraf','аҧсуа бызшәа', ... ,'isiZulu' ]
+
+console.log(ISO6391.getCode('Chinese')) // 'zh'
+console.log(ISO6391.getCode('中文')) // 'zh'
+
+console.log(ISO6391.getAllCodes()) //['aa','ab',...,'zu']
+
+console.log(ISO6391.validate('en')) // true
+console.log(ISO6391.validate('xx')) // false
+
+console.log(ISO6391.getLanguages(['en', 'zh']))
+// [{code:'en',name:'English',nativeName:'English'},{code:'zh',name:'Chinese',nativeName:'中文'}]
+
+```