feat: translations now use crowdin (translate.unraid.net)

[elibosley]

Summary by CodeRabbit

• New Features

  • App-wide internationalization: dynamic locale loading, LocaleSwitcher UI, many locale bundles added, and JSONForms i18n support.
  • CLI helpers: i18n:extract and sort scripts for extracting/syncing translation keys.

• Accessibility

  • Brand button now supports keyboard activation (Enter/Space).

• Documentation

  • Internationalization sections added to API and Web READMEs.

• Refactor

  • Unified i18n loader and migration to composition-API i18n usage across UI.

• Tests

  • Test utilities updated to provide i18n and localized assertions.