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Problem:
The client was experiencing inconsistent language in WooCommerce emails, with some strings appearing in the wrong language. This issue persisted even when all plugins were disabled, and it was exacerbated by plugins that hook into WooCommerce emails, such as 'germanized' and 'Kadence email designer'. The client suspected that the problem was related to the main installation language not being English and that WPML was not respecting the 'wpml_language' meta field of an order when creating emails.

Solution:
We investigated the issue by disabling all plugins and re-enabling them one by one. We discovered that disabling the 'GeoDirectory Multilingual' plugin caused the order interface to revert to English and the email language inconsistency issue did not replicate. This suggests that the 'GeoDirectory Multilingual' plugin might be causing the language translation issue. Unfortunately, further investigation was halted due to a critical error on the staging site after re-enabling the plugins. We advised the client to restore from a backup so we could continue debugging.

If you're experiencing similar issues with the language of your WooCommerce emails, we recommend checking for plugin conflicts, particularly with 'GeoDirectory Multilingual', and ensuring that your site's main language is set correctly. If the solution provided here is not relevant to your case, possibly because it's outdated or not applicable, please open a new support ticket. We also highly recommend checking the related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If you need further assistance, please contact us in the WPML support forum.