LeadByte allows you the alter the language of the Form errors you show so you can tailor to your user base.

Find this feature by going to the Campaign tab > Settings > Form Languages. 

Either add A New Language or Edit an existing Language.

This will allow you to change what response is returned based on the event.

Once you've added your languages, you can choose which to use on the Form settings page.

Find this setting by going to the Campaign tab > Forms > Select > Update Settings.

Finally, here is how the error messages will show on your form -