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Problem:
The client was using WPML to translate their WooCommerce website from English to Spanish. After upgrading to version 4.8, they encountered two issues: a translation engine error stating it does not support Spanish and a 504 Gateway timeout error when changing language settings.
Solution:
The issues were resolved by updating to WPML version 4.8.2. If you're experiencing similar problems, we recommend checking for updates and applying the latest version available. This can often resolve compatibility and functionality issues that arise after upgrades.

Please note that this solution might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum for further assistance.