This thread is resolved. Here is a description of the problem and solution.
Problem:
You want to change the default English translation of strings in WooCommerce order confirmation emails but cannot find where to make these changes.
Solution:
We recommend modifying the text directly in your WooCommerce code file to update the content in your default language. After updating, scan the plugins again from WPML->Themes and plugin localization. After that, you can translate the strings from WPML->String Translation.
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. Should you need further assistance, please do not hesitate to open a new support ticket at WPML support forum.
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