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feat(i18n): add Japanese locale catalogs and negotiation (#3841)

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Co-authored-by: Y.anbe <yoshitaka.anbe@aot.it.com>
Co-authored-by: Carlos Florencio <carlosmflorencio@gmail.com>
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Y.anbe
2026-09-22 07:18:37 +09:00
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@@ -85,7 +85,7 @@ Chat, plan, changes, files, terminal, editor/diff, preview, commit, and pull-req
Every new user-facing string must go through i18next: `t("namespace:key")` or `<Trans>`, never an inline literal. That covers visible copy, `placeholder`, `aria-label`, `title`, `alt`, toasts, validation and empty-state text, and dialog copy. Externalization of the existing UI is complete, so a hardcoded literal is now a regression rather than unfinished migration.
Catalogs live in `apps/web/src/locales/<locale>/<namespace>.json`. English is the source locale and the only hand-authored catalog; it is bundled into the entry chunk, while each other locale is a lazily fetched chunk loaded before that locale activates. Shipped locales are English, European Portuguese, and Simplified Chinese, plus a generated `pseudo` catalog that only development and E2E builds contain. A missing key falls back to English at runtime.
Catalogs live in `apps/web/src/locales/<locale>/<namespace>.json`. English is the source locale and the only hand-authored catalog; it is bundled into the entry chunk, while each other locale is a lazily fetched chunk loaded before that locale activates. Shipped locales are English, European Portuguese, Simplified Chinese, Traditional Chinese (Taiwan), Traditional Chinese (Hong Kong), and Japanese, plus a generated `pseudo` catalog that only development and E2E builds contain. A missing key falls back to English at runtime.
Three mistakes cause silent bugs: never translate a string compared with `===`, never call `t()` at module scope, and never pass an English plural ending as a value; use `count` with `_one`/`_other` keys.