个人习惯macos系统语言为英文，app在默认情况下跟随系统，不像ios可以单独设置。有些专业app上一些专有名词不熟悉还是需要查词典，比较影响效率，需要单独设置app语言。
首先查询app的包名

mdls -name kMDItemCFBundleIdentifier /Applications/Final\ Cut\ Pro.app

然后修改默认语言

修改为中文

defaults write com.apple.FinalCut AppleLanguages '("zh_CN")'

修改为英文

defaults write com.apple.FinalCut AppleLanguages '("en")'

实际写入的文件地址为

~/Library/Preferences/com.apple.FinalCut.plist

默认是没有这个属性的
修改后查询

defaults read com.apple.FinalCut AppleLanguages
(
    "zh_CN"
)

附语言代码
ar = Arabic
cs = Czech
da = Danish
de = German
el = Greek
en = English (US)
es = Spanish
fi = Finnish
fr = French
he = Hebrew
hu = Hungarian
id = Indonesian
it = Italian
ja = Japanese
ko = Korean
nl = Netherlands
no = Norwegian
pl = Polish
pt_PT = Portuguese
pt = Portuguese Brazil
ru = Russian
sk = Slovak
sv = Swedish
th = Thai
tr = Turkish
zh_CN = Chinese Simplified
zh_TW = Chinese Taiwan