This thread is resolved. Here is a description of the problem and solution.
Problem:
The client reported issues with untranslated content on their multilingual website. Specifically, the 'Skin Handle' dropdown was still in Chinese on the Chinese Traditional page, English interface URL snippets appeared in Chinese on WhatsApp, and certain elements on the Checkout page (product names and payment options) were not translated.
Solution:
We recommended the client to use the WPML String Translation to search for and translate the strings that were not appearing in the correct language. For detailed guidance, we suggested visiting the WPML String Translation documentation.
If this solution does not resolve the issue or seems outdated, we advise opening a new support ticket. We also 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. For further assistance, please visit our support forum at WPML Support Forum.
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This topic is split from https://wpml.org/forums/topic/translated-to-another-language-at-the-checkout-page/