There is a grammar error in EMAIL_TEXT from the file 'includes/languages/english/create_account.php'

Specifically, it says:

This is perfect to send birthday gifts direct to the birthday-person themselves.
"direct" is in the wrong form. It should be "directly" and the sentence should read:

This is perfect to send birthday gifts directly to the birthday-person themselves.
(although personally, I'd omit "themselves").