Add localization support and translation script

- Introduced a new extension for localization in Flutter with `LocalizationExtension` in `l10n.dart`.
- Added a Python script `translate.py` for translating ARB/JSON localization files using a local Ollama model, preserving keys and placeholders, and handling ICU format rules.

lib/screens/scanner_screen.dart

@@ -3,6 +3,7 @@ import 'package:flutter_blue_plus/flutter_blue_plus.dart';
 import 'package:provider/provider.dart';
 
 import '../connector/meshcore_connector.dart';
+import '../l10n/l10n.dart';
 import '../widgets/device_tile.dart';
 import 'contacts_screen.dart';
 
@@ -14,7 +15,7 @@ class ScannerScreen extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text('MeshCore Open'),
+        title: Text(context.l10n.scanner_title),
         centerTitle: true,
         automaticallyImplyLeading: false,
       ),
@@ -58,7 +59,7 @@ class ScannerScreen extends StatelessWidget {
                     ),
                   )
                 : const Icon(Icons.bluetooth_searching),
-            label: Text(isScanning ? 'Stop' : 'Scan'),
+            label: Text(isScanning ? context.l10n.scanner_stop : context.l10n.scanner_scan),
           );
         },
       ),
@@ -69,25 +70,26 @@ class ScannerScreen extends StatelessWidget {
     String statusText;
     Color statusColor;
 
+final l10n = context.l10n;
     switch (connector.state) {
       case MeshCoreConnectionState.scanning:
-        statusText = 'Scanning for devices...';
+        statusText = l10n.scanner_scanning;
         statusColor = Colors.blue;
         break;
       case MeshCoreConnectionState.connecting:
-        statusText = 'Connecting...';
+        statusText = l10n.scanner_connecting;
         statusColor = Colors.orange;
         break;
       case MeshCoreConnectionState.connected:
-        statusText = 'Connected to ${connector.deviceDisplayName}';
+        statusText = l10n.scanner_connectedTo(connector.deviceDisplayName);
         statusColor = Colors.green;
         break;
       case MeshCoreConnectionState.disconnecting:
-        statusText = 'Disconnecting...';
+        statusText = l10n.scanner_disconnecting;
         statusColor = Colors.orange;
         break;
       case MeshCoreConnectionState.disconnected:
-        statusText = 'Not connected';
+        statusText = l10n.scanner_notConnected;
         statusColor = Colors.grey;
         break;
     }
@@ -123,8 +125,8 @@ class ScannerScreen extends StatelessWidget {
             const SizedBox(height: 16),
             Text(
               connector.state == MeshCoreConnectionState.scanning
-                  ? 'Searching for MeshCore devices...'
-                  : 'Tap Scan to find MeshCore devices',
+                  ? context.l10n.scanner_searchingDevices
+                  : context.l10n.scanner_tapToScan,
               style: TextStyle(
                 fontSize: 16,
                 color: Colors.grey[600],
@@ -172,7 +174,7 @@ class ScannerScreen extends StatelessWidget {
       if (context.mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(
-            content: Text('Connection failed: $e'),
+            content: Text(context.l10n.scanner_connectionFailed(e.toString())),
             backgroundColor: Colors.red,
           ),
         );