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/test.js

@@ -0,0 +1,32 @@
+var localeEmoji = require('.');
+
+describe('localeEmoji', function() {
+  var tests = {
+    'de': '🇩🇪',
+    'de-DE': '🇩🇪',
+    'de_DE': '🇩🇪',
+    'de-CH': '🇨🇭',
+    'en': '🇺🇸',
+    'EN': '🇺🇸',
+    'en-GB': '🇬🇧',
+    'en-US': '🇺🇸',
+    'EN-US': '🇺🇸',
+    'EN-us': '🇺🇸',
+    'en-us': '🇺🇸',
+    'pt': '🇧🇷',
+    'sk_Latin_SK': '🇸🇰',
+    'eo': '',
+  };
+
+  Object.keys(tests).forEach(function(from) {
+    var to = tests[from];
+
+    it(from + ' -> ' + to, function() {
+      expect(localeEmoji(from)).toEqual(to);
+    });
+  });
+
+  it('should return a empty string for invalid input', function() {
+    expect(localeEmoji('potato')).toEqual('');
+  });
+});