Hebrew locale + i18n improvements

Added

• Hebrew locale (backend .po/.mo and frontend locales/he/translation.json)
• Language list now includes he with basic RTL handling
• Docker build & publish workflow to GHCR

Changed

• i18n init and language detection tweaks

How to pull

• docker pull ghcr.io/ngfblog/warracker:v0.2.0
• Or update compose image to ghcr.io/ngfblog/warracker:v0.2.0 and run:
  • docker compose pull warracker
  • docker compose up -d warracker