The desktop app and the macOS menu bar can now run in English, French, Japanese, Korean, Simplified Chinese and Traditional Chinese. A Language setting in the desktop Settings picks the language or follows the system, and the choice is shared so the menu bar switches with it, relaunching to pick up the language with a retry so a switch never leaves it down.
Every user-facing string in the desktop renderer goes through a local lookup table, 1,249 keys per language, no framework and no network. The menu bar gains four .lproj to join English and Simplified Chinese, 626 keys each. A completeness gate fails the build if any language is missing a key, in both the desktop catalogs and the menu bar coverage suite. Fonts fall back per language so Japanese, Korean and both Chinese render their correct glyph forms, and dates and numbers format for the locale with values unchanged. English output is byte-identical.
Strings produced by the CLI engine stay English until the CLI is localized, a separate effort. Validated live in all six languages: no missing text, no clipping, correct fonts, numbers unchanged, and the menu bar switching for every language.
Settings > General > Language offers System, English and 简体中文. It writes
AppleLanguages into the app's own preferences domain, the same key System
Settings > Language & Region > Applications writes, so the two surfaces are one
setting. The current value is read back from that domain rather than through
UserDefaults.standard, which falls through to the global domain and would
report the system language as CodeBurn's own override: System could then never
show as selected. An inline row offers the relaunch that applies it.
