Hi Erick,
Greetings from Syncfusion support.
We suggest you to set your own customized validation messages based on your language as like the below code. You can set customized language error messages by using the Messages property of ValidationRules.
Please refer and use as like the code below,
</GridColumn>
@code{ IDictionary<string, object> message = new Dictionary<string, object>(){{ "required", "Use you custom language message here" } }; ...}
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Please get back to us if you need further assistance.
Regards,
Renjith Singh Rajendran