How to add language(e.g. Chinese) support

[lmingzhi]

Describe the bug

The characters of non-English look likes square.

To Reproduce

[aaron-jang]

Same happens to me.

I solved it.

The problem is that the font is missing.
I downloaded the font of the language to be used and added it to the volume as shown below, and it was solved.

Using the Container

  ...
  -v ...
  -v {downloaded font directory}:/usr/share/fonts/truetype/{font name}
  ...

Using Docker Compose

  ...
    volumes:
      - ...
      - {downloaded font directory}:/usr/share/fonts/truetype/{font name}
  ...

[sytone]

Thanks for this, updated the documentation with this information.