P0-3: hero widget text rendered hardcoded English on every locale
(ru/hy included) because HeroWidgetData source props were plain
strings with no per-locale variant, unlike nav labels which already
support a locale map (NavigationLocalizedText).
DataSourceResolverService.toHeroData() now accepts either a plain
string (existing tenants unaffected) or a per-locale text map for
title/subtitle/ctaLabel and each slide's fields, resolved against
the active language the same way footer group titles already are
(LocalizedTextContent, current lang -> en -> first available).
Updated the mock bootstrap fixture's hero props to a real ru/en/hy
map so the demo tenant shows translated copy instead of English on
every locale. No editor UI change needed: the Widgets section's
existing JSON-fallback editor already accepts arbitrary prop shapes.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
