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Problem:
The client is trying to translate a string in WooCommerce transactional emails that is added via a custom YayMail hook. The string displays correctly in English but the translated version does not appear in the final email, despite being visible in WPML's string translation table.
Solution:
1. We asked the client to share the code used to add the text to determine if the issue is specific to WooCommerce or another plugin.
2. We suggested adding the text via extra content inside the Email builder to manage different language content, as detailed in our documentation: https://docs.yaycommerce.com/yaymail/integrations/wpml-and-woocommerce-multilingual
3. We recommended trying to add a string as shown in our example documentation to see if that translates. If successful, the client should adjust their current code accordingly. Example code provided:

<p><?php printf( _e( 'CUSTOM TEXT', 'woocommerce' ); ?></p>

Further documentation can be found here: https://wpml.org/documentation/related-projects/woocommerce-multilingual/how-to-translate-woocommerce-emails
4. If these steps do not resolve the issue, we recommended setting up a sandbox test website to reproduce the case for further consultation.

If this solution does not resolve your issue or seems outdated, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. We highly recommend opening a new support ticket for further assistance at WPML support forum.