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ai-for-dummies/.agents/rules/content-i18n.md

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# Rule: content and i18n
## Every user-visible string is content
No hard-coded copy in components. Strings live in `src/content/`, typed with
Zod, and reach components as props or collection entries.
## The existing shape
`app.js` already stores content as `{ en: '…', pt: '…' }` objects across
`phases`, `handsOnPrompts`, `modelGuide`, `skillSources`, and
`skillInstallPrompts` — about 50 `en:` keys. That shape is fine and should be
carried across, not redesigned:
```ts
// src/content/config.ts
const localized = z.object({ en: z.string(), pt: z.string() });
```
Both locales are **required**. A missing `pt` must be a build error, not a
silent English fallback — that is how bilingual sites quietly become
monolingual.
## Migrating strings
Copy, do not retype. These are hand-written translations with specific tone
(`'Transforme ambiguidade em trabalho'`). Retyping introduces typos and drift.
Move the literal, then diff the extracted content against the original file to
prove nothing changed:
```bash
node .agents/scripts/extract-strings.mjs app.js > /tmp/before.json
node .agents/scripts/extract-strings.mjs src/content/guide/ > /tmp/after.json
diff /tmp/before.json /tmp/after.json
```
## Language switching
Today the toggle swaps text client-side and updates `<html lang>`. Two options
for Astro, decide in task 03:
- **Keep client-side swap.** Both languages ship in the payload. Zero routing
change, matches today exactly, no URL work. Recommended — the content is small
and the current behaviour is already what people link to.
- **Route-based (`/en/`, `/pt/`).** Better SEO, more correct, but it changes
every existing URL. Only do this with an explicit decision plus redirects.
Whichever you pick, `<html lang>` must track the active language.
## Rendered content
Markdown in `catalog.js` entries (the `improved` field) should become real
Markdown files in the collection, rendered at build time rather than by a
hand-rolled client-side renderer. That deletes code and improves fidelity.
Careful: `skill-reviews/improved/**/SKILL.md` is **generated** from those
entries by `scripts/build-skill-review.mjs`, and the generated files are
committed. Keep that generator working, or replace it and update every reference
to it.