[shiqimei]

Fennec mixed Chinese implementation/documentation with translated UI copy and used Chinese sentences as translation keys. This moves UI messages into one catalog with stable English IDs and converts project/developer documentation to English while preserving necessary Unicode test fixtures.

The build generates WebView locale data and a compiled native English fallback from the same catalog. Native dialogs, dynamic WebView labels, accessible attributes, and cloned controls keep their message identities across locale changes; user names, session titles, typed input, and terminal output remain untouched. make check now rejects CJK source/documentation outside explicit resources/fixtures and catches missing message references.

Documentation retains acceptance status and historical evidence. Magpie initialization wording is aligned with the already-implemented first-run/saved-choice policy in the project skill and audit; this does not change runtime defaults.

Validation:

• make check, make check-ui, and focused Go race suites pass.
• Native Foundation bundle tests cover the supported locales and missing-resource English fallback.
• Browser rendering with an isolated native-bridge fixture covered all six locales, unchanged user content, and cloned Magpie tooltip updates without message-key leakage.
• Signed macOS staging build, control contract, and package verification pass. The user's installed app and settings were not replaced.