apsis-units and apsis-core are done, 86 of 180 comment blocks in the
layer. The checker in scripts/check-bilingual.py reports which blocks still
lack Chinese, and also catches the two mistakes that are easy to make while
adding a language: a mangled byte sequence, and an English word left inside
a Chinese sentence, which is what happened once in quantity.rs and is now
caught mechanically.
Translations keep terms that have a standard Chinese name in Chinese and
leave proper nouns, abbreviations and method names in English, as the
glossary sets out. The English text is never reworded.
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