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When questions are validated, by default, validation messages are enabled. On the survey header the message: Questions marked with a * are required will show up. You can edit this message if required.
Login » Surveys » (Select Survey) » Edit Survey » Settings
1. Screenshot
Unselect the check mark for: Show Validation Message: This will remove the validation message text from the header. This will also remove the red asterisk displayed beside validated questions.
For multilingual surveys the validation prompts can be edited to display in the selected language. Please see the help link below for Multilingual Surveys.