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/@babel/runtime/helpers/set.js

@@ -0,0 +1,22 @@
+var superPropBase = require("./superPropBase.js");
+var defineProperty = require("./defineProperty.js");
+function set(e, r, t, o) {
+  return set = "undefined" != typeof Reflect && Reflect.set ? Reflect.set : function (e, r, t, o) {
+    var f,
+      i = superPropBase(e, r);
+    if (i) {
+      if ((f = Object.getOwnPropertyDescriptor(i, r)).set) return f.set.call(o, t), !0;
+      if (!f.writable) return !1;
+    }
+    if (f = Object.getOwnPropertyDescriptor(o, r)) {
+      if (!f.writable) return !1;
+      f.value = t, Object.defineProperty(o, r, f);
+    } else defineProperty(o, r, t);
+    return !0;
+  }, set(e, r, t, o);
+}
+function _set(e, r, t, o, f) {
+  if (!set(e, r, t, o || e) && f) throw new TypeError("failed to set property");
+  return t;
+}
+module.exports = _set, module.exports.__esModule = true, module.exports["default"] = module.exports;