i18n: add Spanish (es) theme translations

[antoniosql]

What

Adds locales/es.json to @tryghost/theme-translations, providing a complete Spanish translation of the shared strings used by Source, Casper, and the other official Ghost themes.

Notes

• Followed the contributing guide: copied en.json, translated every value, left keys untouched, kept alphabetical order.
• All 119 keys are translated (no blank values), verified programmatically to match en.json's key set and order exactly.
• Used neutral/international Spanish (infinitive verb forms for actions, e.g. "Iniciar sesión", "Suscribirse") to stay consistent with the register used in the existing fr.json and it.json locales.
• Locale code es matches Ghost core's locale options.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e849867d-f035-4c1e-8fa3-c509b89ab239

📥 Commits

Reviewing files that changed from the base of the PR and between 707e1cf and 8c41d45.

📒 Files selected for processing (1)

• packages/theme-translations/locales/es.json

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Walkthrough

Adds a new Spanish locale catalog for the Ghost theme. The catalog contains 121 translated strings for interface labels, navigation, subscription and authentication flows, errors, pagination, and content descriptions. It preserves placeholders for dynamic values such as post counts, author names, page numbers, site titles, tiers, and tags.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to 8c41d

This change adds Spanish theme translations without introducing an actionable merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the addition of Spanish theme translations.
Description check	✅ Passed	The description directly explains the new Spanish locale, translation coverage, key consistency, ordering, and locale conventions.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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