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Problem:
New order email subject shows placeholders instead of Site Title and date
[{site_title}] New Customer Order ({order_number}) - {order_date}
Solution:
This issue will be fixed in an upcoming version of WooCommerce Multilingual.
In the meantime, you can use the following workaround:
Relevant Documentation:
https://wpml.org/errata/new-order-email-subject-shows-placeholders-instead-of-site-title-and-date-since/