Where is located "Please include an @"

Dear Team,
I can't find anywhere the text:
Please include an '@' should not contain the symbol
This text is showed once a user type in the email box in homepage or in the newsletter popup.

I need to know where is located because I need to translate it, but I couldn't find using standard joomla language override. Any suggestion?

Please check it easily on your demo site homepage
https://demo.gavick.com/joomla3/quark-intro.html

Thanks in advance,

Best,

Rob

Hi

Not 100% sure what You have in mind. Please see my screen. If it's a correct message than I think it's coming from browser since it's using Polish in my case.

Dear Teitbite,
interesting, it is exactly what I had in mind, I checked with a browser set with another language and that message was changing according with new language, thus SOLVED,
Thank you very much,
Rob

Hi
Glad I could help.
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