Include order invoice date in transactional order email to comply with EU regulation

[bamboekeizer]

Description

Add the order invoice issued date variable to be used in the transactional order invoice email

Expected behavior

The behavior of the invoice date inclusion in the transactional email template related to orders invoicing should be similar to the order date. Here the template for the order creation email template:

        <h1>{{trans 'Your Order <span class="no-link">#%increment_id</span>' increment_id=$order.increment_id |raw}}</h1>
        <p>{{trans 'Placed on <span class="no-link">%created_at</span>' created_at=$created_at_formatted |raw}}</p>

Here is the current template for the order invoice, where you can see it is lacking the invoice creation date:

{{trans "Your Invoice #%invoice_id for Order #%order_id" invoice_id=$invoice.increment_id order_id=$order.increment_id}}

Here is the expected template for the order invoice:

{{trans "Your Invoice #%invoice_id for Order #%order_id" invoice_id=$invoice.increment_id order_id=$order.increment_id}}

{{trans 'Create on %created_at' created_at=$created_at_formatted |raw}}

Benefits

Now the order invoice emails comply with the requirements for information on an invoice according to EU regulation:
https://taxation-customs.ec.europa.eu/taxation/vat/vat-businesses/vat-invoicing_en

Additional information

No response

Release note

No response

[m2-assistant]

Hi @bamboekeizer. Thank you for your report.
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