Enable i18n language switching on all pages and hide incomplete features

Added i18n.js script to all main pages (index, database, saraR4, wifi, logs, admin) to enable language switching functionality across the entire application. Commented out Map and Terminal menu items in the sidebar as these pages are not yet ready for production use.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

html/sidebar.html

@@ -41,6 +41,7 @@
           </svg>
         <span data-i18n="sidebar.logs">Logs</span>
       </a>
+      <!-- Hidden: Not ready yet
       <a class="nav-link text-white" href="map.html">
         <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-geo-alt-fill" viewBox="0 0 16 16">
           <path d="M8 16s6-5.686 6-10A6 6 0 0 0 2 6c0 4.314 6 10 6 10m0-7a3 3 0 1 1 0-6 3 3 0 0 1 0 6"/>
@@ -53,6 +54,7 @@
         </svg>
         <span data-i18n="sidebar.terminal">Terminal</span>
       </a>
+      -->
       <a class="nav-link text-white" href="admin.html">
         <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-tools" viewBox="0 0 16 16">
             <path d="M1 0 0 1l2.2 3.081a1 1 0 0 0 .815.419h.07a1 1 0 0 1 .708.293l2.675 2.675-2.617 2.654A3.003 3.003 0 0 0 0 13a3 3 0 1 0 5.878-.851l2.654-2.617.968.968-.305.914a1 1 0 0 0 .242 1.023l3.27 3.27a.997.997 0 0 0 1.414 0l1.586-1.586a.997.997 0 0 0 0-1.414l-3.27-3.27a1 1 0 0 0-1.023-.242L10.5 9.5l-.96-.96 2.68-2.643A3.005 3.005 0 0 0 16 3q0-.405-.102-.777l-2.14 2.141L12 4l-.364-1.757L13.777.102a3 3 0 0 0-3.675 3.68L7.462 6.46 4.793 3.793a1 1 0 0 1-.293-.707v-.071a1 1 0 0 0-.419-.814zm9.646 10.646a.5.5 0 0 1 .708 0l2.914 2.915a.5.5 0 0 1-.707.707l-2.915-2.914a.5.5 0 0 1 0-.708M3 11l.471.242.529.026.287.445.445.287.026.529L5 13l-.242.471-.026.529-.445.287-.287.445-.529.026L3 15l-.471-.242L2 14.732l-.287-.445L1.268 14l-.026-.529L1 13l.242-.471.026-.529.445-.287.287-.445.529-.026z"/>