Add explicit return types and TranslatableInterface support

Updated interfaces to include explicit return types for improved type safety and readability. Integrated support for Symfony's TranslatableInterface in relevant methods to enhance translation handling.

src/Bundle/ChillMainBundle/Export/ExportElementValidatedInterface.php

@@ -31,5 +31,5 @@ interface ExportElementValidatedInterface
      * validate the form's data and, if required, build a contraint
      * violation on the data.
      */
-    public function validateForm(mixed $data, ExecutionContextInterface $context);
+    public function validateForm(mixed $data, ExecutionContextInterface $context): void;
 }