Thank you very much @reynierc
Site A is 2 years old. My processing steps are as follows:
- WordPress dashboard, then to ‘Settings’ > ‘General’. Set English
- Admin profile language is set to Chinese
- Disable plugins, keep woocommerce plugin
- Enable the theme that comes with wordpress,
- The website environment uses automatic theme + woocommerce plugin, test woocommerce orders, change order status, and the email notification received contains Chinese characters
- The administrator profile language is set to site default, test change order status, and the email received is in English.
Conclusion: The characters in the notification sent by email will change according to the administrator profile language, not the language set by the website.
In order to verify whether it is a site problem, I rebuilt a new website B, the website environment uses automatic theme + woocommerce plugin, test orders, and after testing, the above problems have not occurred for the time being.
After deleting the plugin language file of site A and updating the language file, the above problems still exist and the problem has not been found.