In Sitecore Forms there is a checkbox Field that you can set called “is required”
In case the field is required, Sitecore will automatically set
“Fieldname is required”
How can we change that?
well, there is not a good solution where you can change the message for each field,
However, without any coding you can change the “is required.” globally
1)Create an item under /sitecore/system/Dictionary/
2)Name it “is Required”
3)Key must be “{0} is required.”
4)Phrase should be “{0} ” , plus the change on the message
Ex : {0} must be filled.
The final result is the image below, the message will be changed globally, which means, for each required field
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