With Show Font Names in English off (the default), the Character and
Properties font menus draw each family's own-language name in the
interface font. On Windows, Microsoft YaHei's Simplified Chinese family
name is 微软雅黑, and the Han face of an English interface can lack 软.
The app drew a missing-glyph box in its place, and the font search
tests in the effectcraft-ui-egui it binary panicked with "No glyph for
"软"".
A row now draws its own-language name when the interface fonts have a
glyph for each character, and its English family name otherwise. The
row's hover text follows the same rule. Search still matches both names.