SVG image wikisyntax can't use "lang=zh-hant". for example:
https://commons.wikimedia.org/wiki/File:First_Ionization_Energy.svg
In the SVG, systemLanguage include en, fr, de, zh-hans, zh-hant etc.
[[File:First Ionization Energy.svg|thumb|lang=en]] displayed in English;
[[File:First Ionization Energy.svg|thumb|lang=fr]] displayed in French;
[[File:First Ionization Energy.svg|thumb|lang=zh-hans]] displayed in Simplified Chinese;
but [[File:First Ionization Energy.svg|thumb|lang=zh-hant]] error is displayed as Simplified Chinese; the correct display should be Traditional Chinese.
see test case:
* in zhwikipedia: https://zh.wikipedia.org/wiki/User:Shizhao/ss
* in Commons: https://commons.wikimedia.org/wiki/User:Shizhao/s
PS: Like T154132, "lang=zh-Hant" can't work:
[[File:First Ionization Energy.svg|thumb|lang=zh-Hant]] error is displayed as English