feat: Add Spanish translation (es)

[disgran]

This pull request adds support for Spanish in BetterShift.

Changes included:

Added messages/es.json

Updated messages/en.json, messages/it.json, messages/de.json

Updated lib/locales.ts to register the new es locale

Notes:

Only translation files and locale registration were modified.

No changes were made to the Dockerfile, npm configuration, or build process.

If this contribution fits the project roadmap, I would appreciate it if you could merge it and include the Spanish language in the official project, as well as rebuild and update the Docker image so the new locale is available to users.

Summary by CodeRabbit

• New Features
  • Added full Spanish language support with comprehensive UI translations across the app.
  • Spanish now appears in language selection and language name lists (English, German, Italian entries updated).
  • Documentation updated to reflect Spanish localization.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds Spanish locale support: imports date-fns/es, registers "es" in the locales array and dateFnsLocales map, adds Spanish labels to existing message files, and introduces a new comprehensive messages/es.json translation file.

Changes

Cohort / File(s)	Summary
Locale configuration lib/locales.ts	Imported Spanish locale from date-fns/locale, added "es" to exported locales array, and added es entry to internal dateFnsLocales map.
Language labels messages/de.json, messages/en.json, messages/it.json	Added "es" entries to the existing language maps ("Spanisch", "Spanish", "Spagnolo" respectively).
Spanish translations messages/es.json	Added new Spanish translation file (~817 lines) covering all UI namespaces and pluralization/placeholder tokens.
Docs README.md	Updated Features/localization row to include Spanish.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat: centralize localization logic #43: Introduced centralized locales/getDateLocale structure that this change extends by adding Spanish locale and mappings.

Suggested reviewers

• panteLx

Poem

🐰 Hola, español, has hopped in today,
I mapped your dates and taught strings to say,
From lib/locales to messages wide,
Eight-hundred lines where meanings abide,
Hooray — more users can join the play! 🎉✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: Add Spanish translation (es)' directly and clearly summarizes the main change: adding Spanish language support to the application.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@messages/es.json`:
- Around line 1-817: The reviewer asks you to run the i18n validation to ensure
all locale files are synchronized; run the CLI command `npm run i18n`, inspect
the output for missing/unused keys across messages/en.json and messages/it.json
(and any other locales), add or remove keys or update translations to restore
parity with messages/es.json/messages/de.json, re-run `npm run i18n` until it
reports no errors, then commit the updated locale files and the i18n validation
results.

[disgran]

Hi @panteLx, this PR adds Spanish translations. Please consider merging and updating the Docker image so the new locale is available to users. Thank you!

[disgran]

README.md