XSS on Document Generator template description

Xray is vulnerable to XSS by injecting malicious javascript on the template description.

Steps to reproduce:

• Add malicious javascript to the template description

  "><img src=x onerror=javascript:alert(1)>

• Go to an issue and click on Xray Document Generator dialog to export a single issue
• Hover the question mark and the javascript will run

Remediation steps: Sanitize template description