Export to PDF doesn't export special characters

Summary

When exporting a page to a PDF that has special characters in it, the characters are not exported in the PDF (e.g. Chinese language, German characters, etc.)

Steps to Replicate

1. Create a page with Chinese characters on it. Example: 一周有七天
2. Export the page to PDF

Expected Result

The Chinese characters should be shown on the PDF page.

Current Result

The Chinese characters are missing from the PDF page.

Workaround

• Export the page to HTML, open the page, and print to PDF.
• Upload the font file on Confluence's administration section: Create a PDF in Another Language