Disable dyslexia-friendly text preference in non-Latin system

[ryonakano]

Prerequisites

• [x] I have searched open and closed issues for duplicates.

Describe the bug

The dyslexia-friendly text preference only works for Latin characters (because the OpenDyslexic font does not include non-Latin characters maybe). So, if you try to enable this preference on non-Latin systems like Japanese or Chinese, the most characters except Latin characters like English or numbers don't change.

To Reproduce

Steps to reproduce the behavior:

1. Open your terminal
2. Run LANGUAGE=ja_JP io.elementary.switchboard or LANGUAGE=zh_TW io.elementary.switchboard
3. Open Desktop→Appearance
4. Toggle the "Dyslexia-friendly text" switch
5. See non-Latin characters don't change

Expected behavior

Don't show the switch on non-Latin systems.

(Ideally, it would be great if this preference works for any languages, but it requires hard work to the font itself; to add sooooo many number of Chinese characters.)

Platform Information

I'm on Odin Daily.

• [x] I'm using the latest version from git that I've manually compiled
• [ ] I'm using the latest released stable version

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