[lacolaco]

翻訳・修正

Sync angular-ja with the production angular.dev commit 4e4df4a696aa426885af44afbcb13ee58014455d (Angular 22.2.3).

• 翻訳のガイドラインを確認しました。
• 原文ファイルと翻訳ファイルの改行数が一致しています。

関連Issue

No related open issue was found for this upstream sync.

備考

77 translated Markdown pages and four translated application files follow the updated upstream originals. Another 42 untranslated pages, including the three additions below, match upstream English.

1. Aria accordion and tabs now describe removal of hidden content by default and preserveContent for retaining it. Aria page headers follow the upstream presentation.
2. Routing explains concurrent asynchronous guards and result precedence, and adds reduced-motion guidance for view transitions.
3. HTTP setup marks JSONP APIs and legacy HTTP modules deprecated. Signal resource documentation clarifies error-state reads and experimental APIs.
4. Template expressions document expression-body arrow functions. Testing, dependency injection, SSR, CLI deployment, proxy matching, and tutorial examples include upstream corrections.
5. DevTools navigation and the signals guides link to the new signal graph documentation. The home and update-guide templates follow upstream signal bindings, retaining Japanese labels.

Removed / moved pages

Upstream deleted or moved no localized pages in this sync. No translation backups were needed.

Untranslated content

New pages copied in English:

• adev-ja/src/content/reference/errors/NG01055.md
• adev-ja/src/content/reference/errors/NG0904.md
• adev-ja/src/content/tools/devtools/signals.md

The new minDate() / maxDate() explanation and examples in adev-ja/src/content/guide/forms/signals/validation.md remain in English. Existing Japanese content is retained. No page was reset to English.

Test plan

• pnpm test

• pnpm lint

• pnpm run test:unit

• pnpm run test:routes

• Line-count and structural-marker parity checked for all translated pairs.

• Added fenced code-block content checked against English for all 77 updated translated pages.

• No backtick identifier removed upstream remains on the Japanese side.

• Ubuntu production build in CI.

• All English heading IDs restored on the template expressions page so the new local link resolves.

Visual verification

Aria accordion header, deployed 22.2.1 before the sync and this PR locally after the sync:

The update guide loaded the 21.0-22.0 version selection and intermediate complexity from the URL, and displayed Japanese migration instructions and empty-state text after requesting the guide. The new DevTools signal graph page and its Japanese navigation label also rendered.