Issue with Email Subject Translation – WooCommerce Email Template Customizer

Hello VillaTheme Support Team,

I am currently facing an issue with your WooCommerce Email Template Customizer v1.2.8 plugin, which we use to customize and translate our WooCommerce emails.

Issue Encountered:
We have configured emails in two languages: French and English (We are using Polylang for translations on the website).

The customization and translation of the email content work perfectly.
However, we are experiencing an issue with the email subject line:
The subject displays correctly in English.
But it does not translate and remains unchanged in French, despite configuring the language selector.
We would like to know:

If we might have missed an important step during the configuration process.
Or if this could be a bug or a known limitation of the plugin.
Could you please guide us on how to resolve this issue? If you need any additional information, I am happy to provide it.

Thank you in advance for your assistance.