Implement i18n for Sidebar.tsx and add translations for "navigation" and "management" in ar.json and en.json. Replit-Commit-Author: Agent Replit-Commit-Session-Id: c5f0c281-8dd8-4846-b452-4a07bcd21062 Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9777c70b-fc38-4831-8d6b-78dfffe041b0/9a425c2c-163d-44cd-bc94-651bb15ed83f.jpg