Custom validation messages saved on a question in the survey are automatically added to the library to make it easy for all the users in the organization to reuse any of the messages for their surveys, the messages in the library can be translated into 80+ languages.
To add a new validation message to your library
Go to: Login » Surveys » Organization » Libraries » Validation Messages.To translate a validation message in the library
Go to: Login » Surveys » Organization » Libraries » Validation Messages.You can use the import translation option to bulk translate all the messages in your library, to use the bulk import option.
Go to: Login » Surveys » Organization » Libraries » Validation Messages. Click on Import Translations.
No, changes made in the library will not change the message on any existing surveys, to use the edited message on the survey you will need to select the new message by editing the survey.
No, validation messages when deleted from the library will not change the messages on the existing surveys.
Yes, you can use custom variables in the messages.
No, currently all users have access to Add, Edit or Delete validation messages from the library.