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By following guide from the below, you can easily customize the warning messages for your form,
If you need any extra information or help, please do let us know.
I checked your form and found the related message "Você esqueceu de preencher este campo é obrigatório." on "This Field is Required". Please, see it from the below:
You can easily find it by using the "Command + F" search function of your form. After doing the "Command + F" combination copy & paste the "Você esqueceu de preencher este campo é obrigatório.", it will find the related sentence. Please, try this one and let us know the results.