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/.travis.yml

@@ -0,0 +1,10 @@
+sudo: false
+
+language: node_js
+node_js:
+  - '4'
+  - '6'
+  - 'stable'
+
+after_success:
+  - cat coverage/lcov.info | node_modules/.bin/coveralls