Comment 48 for bug 1227034

Well, if you run fc-match with the zh_TW.UTF-8 locale (which in fact simulates the use of Traditional Chinese as the display language), it indeed should make a difference if you install version 0.129.2 of language-selector-*.

OTOH, if you actually are using English as the display language, a more adequate test is:

fc-match -a 'sans-serif'

That should result in a long list, and you ought to see a bunch of Droid Sans fonts (including DroidSansFallbackFull.ttf) before AR PL UMing TW.