After you add WPML or another translation plugin, the booking widget on your translated pages may break, with its images and scripts returning 404 errors.
Why this happens. When a translation plugin adds a language prefix to the URL (for example /en/ or /fr/), it can rewrite asset paths inside the page so they include that prefix. A path such as /wp-content/… becomes /en/wp-content/… These translated paths do not exist, so the assets return 404 errors and the booking widget stops working.
What you can do. Restoring the correct asset URLs on translated pages requires a small code fix on your site. Contact support to have the fix added.