Show HN: Expressio – internationalization tooling for translators and AI

Expressio simplifies i18n workflows with tooling that works for both human translators and AI. Type-safe translations, AI translation support (DeepL, Claude), and code sync.

Instead of magic strings like `$t('menu.settings')`, you use typed references: `$t(i18n.menu.settings)`. TypeScript knows about all translations, IDE autocomplete works, and refactoring is safe. The type-safe approach also makes it easy for AI tools to understand and work with translations.

Features:

- AI translation via DeepL/Claude

- Type-safe translations (no magic strings)

- CLI + web UI

- Real-time WebSocket sync

- Lint to find missing translations in code

Works with i18next format. Uses a workspace file (`.expressio.json`) to track source text and translations. Built partly with AI assistance to speed up development.