Issue Summary
Forms containing multibyte characters such as Japanese cannot be exported to PDF correctly. Multibyte characters are replaced by ###.

Steps to Reproduce
Create a form and link it to a request type
Raise a request using the above form with multibyte characters such as Japanese:

Export the submitted form to PDF by clicking ... > Download PDF / Download RIch PDF
Expected Results
A downloaded PDF file contains multibyte characters.

Actual Results
A downloaded PDF file doesn't contains multibyte characters, and they are replaced by ###.

Workaround
Use Download XLSX which contains multibyte characters correctly