Mistyped email error

I have noticed that if customer by mistake enters any special characters in the email field for example xxx,xxx@xxx.xxx and then tries to place an order, he simply gets an alert which says “error” and not the usual message that says “ doesn’t appear to be valid email”
Many clients can’t figure out what they done wrong and they abandon the order.
Any idea how to fix this?

Version
OC3.0.3.2 + Journal

You will find this in your catalog/language
checkout/checkout.php file

Opencart standard
E-Mail address does not appear to be valid!

So this is journal - you can ask your theme developer for support

thank you