Cant find where to translate the confirmation email

Hi, I have searched the .po file and the confirmation-mail-template.php
files, but cant find where to translate the content of the email,
I have the Subject translated on the .po file but cant find this text:

Howdy.

You recently signed up to be notified of new posts on my blog. This means
once you confirm below, you will receive an email when posts are published.

To activate, click confirm below. If you believe this is an error, ignore this message
and nothing more will happen.

Confirm Suscription

Thanks a lot