feat(i18n): add Austrian translation

[trueberryless]

🧭 Context

The Austrian and German language have some little differences here and there, that's why I decided to add support for the Austrian language.

📚 Description

I moved all de-DE strings to de.json, so I don't have to override any in de-DE.json and created a new de-AT.json which overrides the few strings that need to be different. I also adapted the config and it seems that the code de-AT was not satisfying the type, so I ran pnpm generate, but I'm not sure if that fixed it. It would maybe be a good idea to mention how to fix the GeneratedLocale type in the CONTRIBUTING.md section:

npmx.dev/CONTRIBUTING.md

Lines 507 to 517 in 1fd2d53

	#### Country variants (advanced)
	Most languages only need a single locale file. Country variants are only needed when you want to support regional differences (e.g., `es-ES` for Spain vs `es-419` for Latin America).
	If you need country variants:
	1. Create a base language file (e.g., `es.json`) with all translations
	2. Create country variant files (e.g., `es-ES.json`, `es-419.json`) with only the differing translations
	3. Register the base language in `locales` and add variants to `countryLocaleVariants`
	See how `es`, `es-ES`, and `es-419` are configured in [config/i18n.ts](./config/i18n.ts) for a complete example.

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Tracked Files

File	Note
i18n/locales/de-DE.json	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3d6a3c26-6ed9-4435-879d-a295bbe60b8a

📥 Commits

Reviewing files that changed from the base of the PR and between 1fd2d53 and c768716.

📒 Files selected for processing (4)

• config/i18n.ts
• i18n/locales/de-AT.json
• i18n/locales/de-DE.json
• i18n/locales/de.json

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📝 Walkthrough

Walkthrough

This pull request restructures the German i18n locale configuration from a single de-DE base locale to a variant-based system. The config/i18n.ts file was modified to define a de base locale with de-DE and de-AT variant expansions. The de-DE.json file was emptied to contain only a schema reference, whilst new de.json and de-AT.json files were created containing comprehensive German and Austrian German translations respectively.

Possibly related PRs

• feat(i18n): update German translations #880: Modifies German i18n files (notably de-DE.json) and affects the same translation resources.
• chore(i18n): update German translation #2246: Updates German locale files with changes that directly overlap on the same localisation assets.
• feat(i18n): update German translations #1033: Involves restructuring of German locales with similar transformation of the locale configuration and file structure.

Suggested reviewers

• danielroe
• OrbisK
• userquin

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description clearly explains the purpose of adding Austrian language support, the approach taken (moving de-DE strings to de.json as a base, creating de-AT.json for Austrian-specific overrides), and mentions relevant changes to the config and type generation.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[ghostdevv]

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