The course now speaks your language: lessons in Chinese, Hindi, Spanish, Arabic, and Turkish

[rohitg00]

The course is no longer English-only. Lessons are now machine-translated into Simplified Chinese, Hindi, Spanish, Arabic, and Turkish, and the site can serve every lesson in your language.

How to use it

Pick a language from the selector in the site header (homepage or any lesson page), or add ?lang=zh (or hi, es, ar, tr) to a lesson URL. Arabic renders right-to-left. Any lesson whose translation has not landed yet falls back to English automatically, so nothing ever breaks while the rollout completes.

Translations are landing phase by phase right now. If a lesson you open is still English in your language, check back; the pipeline publishes continuously.

The README speaks 12 languages

Separate from the machine-translated lessons, the repository README's landing copy is hand-translated into Spanish, French, Portuguese, German, Italian, Chinese, Japanese, Korean, Hindi, Arabic, Russian, and Turkish. Links are in the header of the README.

How it works, for the curious

• English is canonical. Every translation is generated from it and regenerates automatically whenever the English source changes.
• The engine is NLLB-200, an open translation model that runs inside the CI runner. No API keys, no per-token bill; the entire pipeline costs nothing to operate.
• Technical content is protected mechanically: code blocks, inline code, math, tables, links, and diagrams pass through byte-for-byte. Only prose is translated, and a round-trip check enforces it.
• Translated lessons live on a dedicated branch, never on main, and the site fetches them at runtime the same way it fetches English. The repository you clone stays English-only and lean.

Full design notes in docs/i18n.md.

Caveats and requests

These are machine translations of deeply technical material. They are faithful on structure by construction, but phrasing can be imperfect. If you find a translation that misleads rather than helps, open an issue naming the lesson and language. Want your language added? The registry in languages.json is the single switch; open an issue and make the case.