Default language
Traditional Chinese is the default language and has no URL prefix; English lives under /en/. For example /help is the Chinese Help Center and /en/help is the English one.
The URL decides the language
Because the URL decides the language, a shared link opens in the same language for everyone. Old /zh/ URLs permanently redirect to the unprefixed Chinese URLs.
Switching keeps you on the same page
The language switch keeps you on the same logical page, including the same course, module and section.
Stable, language-neutral IDs
Courses, modules, sections, practice tasks, questions and help articles use the same IDs in both languages, so progress and links keep working when you switch.
Content parity
Each language is written separately, never browser auto-translated, and automated tests check that both languages have exactly the same structure.
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