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-http-backend/esm/utils.js

@@ -0,0 +1,26 @@
+function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
+var arr = [];
+var each = arr.forEach;
+var slice = arr.slice;
+export function defaults(obj) {
+  each.call(slice.call(arguments, 1), function (source) {
+    if (source) {
+      for (var prop in source) {
+        if (obj[prop] === undefined) obj[prop] = source[prop];
+      }
+    }
+  });
+  return obj;
+}
+export function hasXMLHttpRequest() {
+  return typeof XMLHttpRequest === 'function' || (typeof XMLHttpRequest === "undefined" ? "undefined" : _typeof(XMLHttpRequest)) === 'object';
+}
+function isPromise(maybePromise) {
+  return !!maybePromise && typeof maybePromise.then === 'function';
+}
+export function makePromise(maybePromise) {
+  if (isPromise(maybePromise)) {
+    return maybePromise;
+  }
+  return Promise.resolve(maybePromise);
+}