Fix/issue 813 xss sanitization

[Nancy-3012]

Description

Please include a summary of the changes and the related issue.

Closes #813

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (non-breaking chore/doc change)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• Manually tested local server
• Frontend build verification
• Unit/Integration tests added or updated

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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