Adds row_direction_sent / row_direction_received keys across the
three locale files (de: Gesendet/Empfangen, en: Sent/Received, es:
Enviada/Recibida) and routes ThumbnailRow's directionLabel through
Paraglide. An English or Spanish screen-reader user now hears
"Sent:" / "Enviada:" in their language, matching the DistributionBar
i18n pass.
Refs #305
Fixes @leonievoss round-2 follow-up from PR review
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
f5a30c71b7