Refactor project data structure, add internationalization support, and enhance UI components

- Updated project data files to improve formatting and consistency.
- Introduced language support with English and Dutch translations.
- Implemented language switcher and dark mode toggle in the header and footer.
- Enhanced navigation components to utilize internationalized strings.
- Refactored layout components to use Grid2 for better responsiveness.
- Improved accessibility and usability across various components.

src/lang/index.js

@@ -0,0 +1,9 @@
+export { default as en } from "./en.json";
+export { default as es } from "./nl.json";
+
+const messages = {
+  en: require("./en.json"),
+  nl: require("./nl.json"),
+};
+
+export default messages;