The API now always sends restaurant.tagline/blurb as {en, gr} objects,
including when a site hasn't set them yet (both null). The old
`?? r.tagline` fallback rendered the whole object as a React child in
that case (React error #31) instead of falling back to a display
string. Fall back to the localized fallback string instead.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>