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Go to: Surveys (Select Survey) » Edit » Design
Under the design tab, click on Display Settings
Here, you can change validation message and settings.For multilingual surveys the validation prompts can be edited to display in the selected language.
This feature/tools described here are available with the following license(s) :
Free License and above
Multilingual Surveys - How To?
Validation Settings - Global Update
Exclusive Option Validation for Multiple Choice Questions - How to?