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Feature request: Multi-language UI with a language selector (i18n) #781

Description

@zl-Crytrop

Feature Description

Problem

The entire product surface — website, docs, desktop app, and CLI — is English-only.
There is no language option anywhere in Settings (General / Appearance / Agent /
Taste / MCP / Account), and no way for users to switch the interface language.

For a tool positioned as a frontier coding agent, this is an adoption bottleneck
in non-English markets.

Suggested solution

Add a Language dropdown under Settings → General, letting each user
freely pick their interface language. Suggested launch set:

  • English (default)
  • 简体中文 (zh-CN)
  • 日本語 (ja)
  • Español (es)
  • Português (pt-BR)
  • Deutsch (de) / Français (fr) / 한국어 (ko) as follow-ups

Scope for v1: desktop app UI + the most-visited docs pages.

Implementation notes:

  • Build the i18n layer on a standard framework so adding a language is a
    translation file, not a code change
  • If in-house translation isn't planned, a community workflow (e.g., Crowdin)
    keeps marginal cost near zero — especially if the i18n layer is added early
    rather than retrofitted later

I'm filing this as a product suggestion; happy to help test new languages once
shipped.

Use Case

  • Market size: The majority of the world's ~30M developers are non-native
    English speakers. China alone has ~7M professional developers (the largest
    single population globally), and strong dev communities exist across Japan,
    Brazil, Korea, and Spanish-speaking Latin America.

  • Competitive parity: Cursor, Windsurf, and Trae already ship official
    multi-language / Simplified Chinese UIs. Trae's rapid growth is partly
    attributed to localization. English-only is becoming a visible gap.

  • Brand consistency: Non-English content about Command Code today is almost
    entirely third-party reviews and machine-translated blog posts — mixed
    messaging, no quality control, no positioning leverage. Official localization
    would consolidate all of it.

  • Low cost, compounding return: A language dropdown is a one-time i18n
    investment; each new language after that is just a translation file, often
    community-contributed.

Additional Context

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