When use Headless Browsers to take screenshots of a web page, the non-English characters might not be displayed correctly if no right fonts installed.
To fix this, we have to install special fonts.
Fix Steps
Copy TTF files to /usr/share/fonts/east_asian
You can get TTF files from a windows PC(c:\windows\fonts or so), etc. Rename TTC to TTF if needed.
Restore Debian Font Cache
mkfontscale
# if this is not found, install it
# apt-get install ttf-mscorefonts-installer
mkfontdir
fc-cache -fv
Refresh System
Call . /etc/profile or reboot.