The i18n epic (T-462): every user-facing label — panels, dialogs, command
palette, menus, settings, framework chrome — now resolves through the i18n
catalog instead of a hardcoded string. Catalogs are bundled per locale under
assets/i18n/<locale>/<namespace>.json. Adds a live UI-language selector
(Settings → Appearance → Language) and a full Dutch (nl-NL) pack; English
stays the default. Architecture in D-102.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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