The packages with "Microsoft-Windows-LanguageFeatures" prefix is not real language packs. They just provide several language features like the Pinyin or Wubi IME etc. The real language pack is called "Microsoft-Windows-Client-LanguagePack", which contains lots of MUIs.
中文输入补齐词库了:带有“Microsoft-Windows-LanguageFeatures”前缀的包不是真正的语言包。它们只是提供几种语言功能,如拼音或五笔输入法等。真正的语言包被称为“Microsoft-Windows-Client-LanguagePack”,其中包含许多 MUI 文件。
I'm using English version of 25398.1.