Those are the names of the settings. I explained why they are not translatable in 有没有比较好的中文插件 - #2 by Moin.
You cannot customize texts that aren’t translatable in the admin interface.
By the way, if I happened to overlook something regarding this plugin’s ability to also modify backend text, I’m still pretty sure that it only changes translatable text, not other text in the interface. It’s about replacing words in texts, not allowing the translation of untranslatable texts.