Hi Gio,
We apologize for any inconvenience you've experienced. We've carefully reviewed your query and have prepared a sample to demonstrate how to change the language of automatically generated messages in the Syncfusion SfTextBox, such as "this field is required," to Italian.
Please find the attached sample for your reference.
If you have any further questions or need additional assistance, please don't hesitate to reach out to us. We're here to help.
Attachment:
Localizationwithdynamicculture_3aa62958.zip