[Bug]: Download page i18n description still says 'exploring the metaverse'

## Describe the bug

The `page.download.description` i18n key in 5 of 6 locale files still says "exploring the metaverse" (e.g., en: "Download Decentraland and start exploring the metaverse"). This is off-tone vs the current social positioning.

The key is not currently wired to a `` tag at runtime (the `/download` route falls through to `index.html`'s default description, which is already on-message), but the dormant string could resurface if someone wires it up. It should be updated to match the current positioning.

## Affected files

- `src/intl/en.json` — "Download Decentraland and start exploring the metaverse"
- `src/intl/fr.json` — "Téléchargez Decentraland et commencez à explorer le métavers"
- `src/intl/ja.json` — "Decentralandをダウンロードしてメタバースの探検を始めましょう"
- `src/intl/ko.json` — "Decentraland를 다운로드하고 메타버스 탐험을 시작하세요"
- `src/intl/zh.json` — "下载 Decentraland 开始探索元宇宙"
- `src/intl/es.json` — already updated ("comienza a divertirte" / "start having fun")

## Expected behavior

All locale descriptions should align with the current social positioning (e.g., "Download Decentraland and come hang out").

## Found by

Synthetic UX research (AI persona journeys PoC, Stoyan, Jul 4 2026)