Nintendo 3DS version filename error with non latin languages

First and foremost consider this:

• Only RetroArch bugs should be filed here. Not core bugs or game bugs
• This is not a forum or a help section, this is strictly developer oriented

Description

The filename of non latin words, like japanese, Korean, Chinese... etc shows ??? in nintendo 3DS version.

Expected behavior

unicode or font problem

Actual behavior

The filename of romfiles on asian languages, do not show up.
and it apears like ???

Steps to reproduce the bug

1. change rom filename like this(copy and paste please) on PC "파일이름 or 經路名"
2. then put in your 3ds SD card
3. You can see question marks on romfile names

Bisect Results

old version is same,

Version/Commit

You can find this information under Information/System Information

• RetroArch: [version/commit]

Environment information

• OS: [nintendo 3ds]
• Compiler: [In case you are running local builds]

The report identifies no source file, test, or version/commit. First reproduce on a Nintendo 3DS with the filenames "파일이름" and "經路名" and determine whether the failure is in Unicode or font handling; done means Asian-language ROM filenames render correctly instead of ???.