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/locale-emoji/update-defaults.js

@@ -0,0 +1,40 @@
+var fs = require('fs');
+
+var cldr = require('cldr-core/supplemental/likelySubtags.json');
+var likelySubtags = cldr.supplemental.likelySubtags;
+
+var defaultsCode = 'var defaults = {\n';
+
+Object.keys(likelySubtags).forEach(key => {
+  if (key.indexOf('und-') === 0 || (/-[A-Z]{2}$/g).test(key)) {
+    return;
+  }
+
+  var locale = likelySubtags[key];
+
+  var split = locale.toUpperCase().split(/-|_/);
+  if (split.length < 2) {
+    return;
+  }
+
+  var code = split.pop();
+  if (!code || code === 'ZZ' || !/^[A-Z]{2}$/.test(code)) {
+    return;
+  }
+
+  if (key.indexOf('-') !== -1) {
+    key = `'${key}'`;
+  }
+
+  defaultsCode += `  ${key}: '${code}',\n`;
+});
+
+defaultsCode += '};\n';
+
+let path = `${__dirname}/index.js`;
+
+let content = fs.readFileSync(path, 'utf-8')
+  .replace(/\/\/ --- DEFAULTS START ---\n((.|\n)+)\/\/ --- DEFAULTS END ---/gm,
+    `// --- DEFAULTS START ---\n${defaultsCode}// --- DEFAULTS END ---`);
+
+fs.writeFileSync(path, content, 'utf-8');