diff --git a/lib/screens/settings/sections/queue_section.dart b/lib/screens/settings/sections/queue_section.dart
index d6b2a20..4c4d946 100644
--- a/lib/screens/settings/sections/queue_section.dart
+++ b/lib/screens/settings/sections/queue_section.dart
@@ -112,7 +112,7 @@ class QueueSection extends StatelessWidget {
                               ? Colors.red 
                               : _getUploadModeColor(upload.uploadMode),
                         ),
-                        title: Text(locService.t('queue.cameraWithIndex', params: [(index + 1).toString()]) +
+                        title: Text(locService.t('queue.itemWithIndex', params: [(index + 1).toString()]) +
                             (upload.error ? locService.t('queue.error') : "") +
                             (upload.completing ? locService.t('queue.completing') : "")),
                         subtitle: Text(
diff --git a/lib/services/localization_service.dart b/lib/services/localization_service.dart
index 41bf904..1125302 100644
--- a/lib/services/localization_service.dart
+++ b/lib/services/localization_service.dart
@@ -25,42 +25,32 @@ class LocalizationService extends ChangeNotifier {
 
   Future<void> _discoverAvailableLanguages() async {
     _availableLanguages = [];
-    
+
     try {
-      // Get the asset manifest to find all localization files
-      final manifestContent = await rootBundle.loadString('AssetManifest.json');
-      final Map<String, dynamic> manifestMap = json.decode(manifestContent);
-      
-      // Find all .json files in lib/localizations/
-      final localizationFiles = manifestMap.keys
-          .where((String key) => key.startsWith('lib/localizations/') && key.endsWith('.json'))
+      final assetManifest = await AssetManifest.loadFromAssetBundle(rootBundle);
+      final localizationAssets = assetManifest.listAssets()
+          .where((path) => path.startsWith('lib/localizations/') && path.endsWith('.json'))
           .toList();
-      
-      for (final filePath in localizationFiles) {
-        // Extract language code from filename (e.g., 'lib/localizations/pt.json' -> 'pt')
-        final fileName = filePath.split('/').last;
-        final languageCode = fileName.substring(0, fileName.length - 5); // Remove '.json'
-        
+
+      for (final assetPath in localizationAssets) {
         try {
-          // Try to load and parse the file to ensure it's valid
-          final jsonString = await rootBundle.loadString(filePath);
+          final jsonString = await rootBundle.loadString(assetPath);
           final parsedJson = json.decode(jsonString);
-          
-          // Basic validation - ensure it has the expected structure
+
           if (parsedJson is Map && parsedJson.containsKey('language')) {
+            final languageCode = assetPath.split('/').last.replaceAll('.json', '');
             _availableLanguages.add(languageCode);
             debugPrint('Found localization: $languageCode');
           }
         } catch (e) {
-          debugPrint('Failed to load localization file $filePath: $e');
+          debugPrint('Failed to load localization file $assetPath: $e');
         }
       }
     } catch (e) {
-      debugPrint('Failed to read AssetManifest.json: $e');
-      // If manifest reading fails, we'll have an empty list
-      // The system will handle this gracefully by falling back to 'en' in _loadSavedLanguage
+      debugPrint('Failed to load asset manifest: $e');
+      _availableLanguages = ['en'];
     }
-    
+
     debugPrint('Available languages: $_availableLanguages');
   }
 
@@ -119,28 +109,31 @@ class LocalizationService extends ChangeNotifier {
     notifyListeners();
   }
 
-  String t(String key, {List<String>? params}) {
+  String t(String key, {List<String>? params}) =>
+      lookup(_strings, key, params: params);
+
+  /// Pure lookup function used by [t] and available for testing.
+  static String lookup(Map<String, dynamic> strings, String key,
+      {List<String>? params}) {
     List<String> keys = key.split('.');
-    dynamic current = _strings;
-    
+    dynamic current = strings;
+
     for (String k in keys) {
       if (current is Map && current.containsKey(k)) {
         current = current[k];
       } else {
-        // Return the key as fallback for missing translations
         return key;
       }
     }
-    
+
     String result = current is String ? current : key;
-    
-    // Replace parameters if provided - replace first occurrence only for each parameter
+
     if (params != null) {
       for (int i = 0; i < params.length; i++) {
         result = result.replaceFirst('{}', params[i]);
       }
     }
-    
+
     return result;
   }
 
diff --git a/pubspec.lock b/pubspec.lock
index 2a86471..c266e82 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -106,7 +106,7 @@ packages:
     source: hosted
     version: "1.1.2"
   collection:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: collection
       sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
@@ -601,7 +601,7 @@ packages:
     source: hosted
     version: "1.1.0"
   path_provider:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path_provider
       sha256: "50c5dd5b6e1aaf6fb3a78b33f6aa3afca52bf903a8a5298f53101fdaee55bbcd"
diff --git a/scripts/validate_localizations.dart b/scripts/validate_localizations.dart
deleted file mode 100644
index aad88ff..0000000
--- a/scripts/validate_localizations.dart
+++ /dev/null
@@ -1,154 +0,0 @@
-#!/usr/bin/env dart
-
-import 'dart:convert';
-import 'dart:io';
-
-const String localizationsDir = 'lib/localizations';
-const String referenceFile = 'en.json';
-
-void main() async {
-  print('🌍 Validating localization files...\n');
-  
-  try {
-    final result = await validateLocalizations();
-    if (result) {
-      print('✅ All localization files are valid!');
-      exit(0);
-    } else {
-      print('❌ Localization validation failed!');
-      exit(1);
-    }
-  } catch (e) {
-    print('💥 Error during validation: $e');
-    exit(1);
-  }
-}
-
-Future<bool> validateLocalizations() async {
-  // Get all JSON files in localizations directory
-  final locDir = Directory(localizationsDir);
-  if (!locDir.existsSync()) {
-    print('❌ Localizations directory not found: $localizationsDir');
-    return false;
-  }
-  
-  final jsonFiles = locDir
-      .listSync()
-      .where((file) => file.path.endsWith('.json'))
-      .map((file) => file.path.split('/').last)
-      .toList();
-  
-  if (jsonFiles.isEmpty) {
-    print('❌ No JSON localization files found');
-    return false;
-  }
-  
-  print('📁 Found ${jsonFiles.length} localization files:');
-  for (final file in jsonFiles) {
-    print('   • $file');
-  }
-  print('');
-  
-  // Load reference file (English)
-  final refFile = File('$localizationsDir/$referenceFile');
-  if (!refFile.existsSync()) {
-    print('❌ Reference file not found: $referenceFile');
-    return false;
-  }
-  
-  Map<String, dynamic> referenceData;
-  try {
-    final refContent = await refFile.readAsString();
-    referenceData = json.decode(refContent) as Map<String, dynamic>;
-  } catch (e) {
-    print('❌ Failed to parse reference file $referenceFile: $e');
-    return false;
-  }
-  
-  final referenceKeys = _extractAllKeys(referenceData);
-  print('🔑 Reference file ($referenceFile) has ${referenceKeys.length} keys');
-  
-  bool allValid = true;
-  
-  // Validate each localization file
-  for (final fileName in jsonFiles) {
-    if (fileName == referenceFile) continue; // Skip reference file
-    
-    print('\n🔍 Validating $fileName...');
-    
-    final file = File('$localizationsDir/$fileName');
-    Map<String, dynamic> fileData;
-    
-    try {
-      final content = await file.readAsString();
-      fileData = json.decode(content) as Map<String, dynamic>;
-    } catch (e) {
-      print('   ❌ Failed to parse $fileName: $e');
-      allValid = false;
-      continue;
-    }
-    
-    final fileKeys = _extractAllKeys(fileData);
-    final validation = _validateKeys(referenceKeys, fileKeys, fileName);
-    
-    if (validation.isValid) {
-      print('   ✅ Structure matches reference (${fileKeys.length} keys)');
-    } else {
-      print('   ❌ Structure validation failed:');
-      for (final error in validation.errors) {
-        print('      • $error');
-      }
-      allValid = false;
-    }
-  }
-  
-  return allValid;
-}
-
-/// Extract all nested keys from a JSON object using dot notation
-/// Example: {"user": {"name": "John"}} -> ["user.name"]
-Set<String> _extractAllKeys(Map<String, dynamic> data, {String prefix = ''}) {
-  final keys = <String>{};
-  
-  for (final entry in data.entries) {
-    final key = prefix.isEmpty ? entry.key : '$prefix.${entry.key}';
-    
-    if (entry.value is Map<String, dynamic>) {
-      // Recurse into nested objects
-      keys.addAll(_extractAllKeys(entry.value as Map<String, dynamic>, prefix: key));
-    } else {
-      // Add leaf key
-      keys.add(key);
-    }
-  }
-  
-  return keys;
-}
-
-class ValidationResult {
-  final bool isValid;
-  final List<String> errors;
-  
-  ValidationResult({required this.isValid, required this.errors});
-}
-
-ValidationResult _validateKeys(Set<String> referenceKeys, Set<String> fileKeys, String fileName) {
-  final errors = <String>[];
-  
-  // Find missing keys
-  final missingKeys = referenceKeys.difference(fileKeys);
-  if (missingKeys.isNotEmpty) {
-    errors.add('Missing ${missingKeys.length} keys: ${missingKeys.take(5).join(', ')}${missingKeys.length > 5 ? '...' : ''}');
-  }
-  
-  // Find extra keys
-  final extraKeys = fileKeys.difference(referenceKeys);
-  if (extraKeys.isNotEmpty) {
-    errors.add('Extra ${extraKeys.length} keys not in reference: ${extraKeys.take(5).join(', ')}${extraKeys.length > 5 ? '...' : ''}');
-  }
-  
-  return ValidationResult(
-    isValid: errors.isEmpty,
-    errors: errors,
-  );
-}
\ No newline at end of file
diff --git a/test/services/localization_service_test.dart b/test/services/localization_service_test.dart
new file mode 100644
index 0000000..2f8d44e
--- /dev/null
+++ b/test/services/localization_service_test.dart
@@ -0,0 +1,177 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:deflockapp/services/localization_service.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:path/path.dart' as p;
+
+const String localizationsDir = 'lib/localizations';
+
+/// Recursively extract all dot-notation leaf keys from a JSON map.
+Set<String> extractLeafKeys(Map<String, dynamic> data, {String prefix = ''}) {
+  final keys = <String>{};
+  for (final entry in data.entries) {
+    final key = prefix.isEmpty ? entry.key : '$prefix.${entry.key}';
+    if (entry.value is Map<String, dynamic>) {
+      keys.addAll(
+        extractLeafKeys(entry.value as Map<String, dynamic>, prefix: key),
+      );
+    } else {
+      keys.add(key);
+    }
+  }
+  return keys;
+}
+
+void main() {
+  // ── Group 1: Localization file integrity ──────────────────────────────
+
+  group('Localization file integrity', () {
+    late Directory locDir;
+    late List<File> jsonFiles;
+
+    setUpAll(() {
+      locDir = Directory(localizationsDir);
+      if (locDir.existsSync()) {
+        jsonFiles = locDir
+            .listSync()
+            .whereType<File>()
+            .where((f) => f.path.endsWith('.json'))
+            .toList();
+      } else {
+        jsonFiles = <File>[];
+      }
+    });
+
+    test('localization directory exists and contains JSON files', () {
+      expect(locDir.existsSync(), isTrue);
+      expect(jsonFiles, isNotEmpty);
+    });
+
+    test('en.json exists (required fallback language)', () {
+      final enFile = File('$localizationsDir/en.json');
+      expect(enFile.existsSync(), isTrue);
+    });
+
+    test('every JSON file is valid JSON with a language.name key', () {
+      for (final file in jsonFiles) {
+        final name = p.basename(file.path);
+        final content = file.readAsStringSync();
+        final Map<String, dynamic> data;
+        try {
+          data = json.decode(content) as Map<String, dynamic>;
+        } catch (e) {
+          fail('$name is not valid JSON: $e');
+          return; // unreachable, keeps analyzer happy
+        }
+        expect(
+          data['language'],
+          isA<Map>(),
+          reason: '$name missing "language" object',
+        );
+        expect(
+          (data['language'] as Map)['name'],
+          isA<String>(),
+          reason: '$name missing "language.name" string',
+        );
+      }
+    });
+
+    test('file names are valid 2-3 letter language codes', () {
+      final codePattern = RegExp(r'^[a-z]{2,3}$');
+      for (final file in jsonFiles) {
+        final code = p.basenameWithoutExtension(file.path);
+        expect(
+          codePattern.hasMatch(code),
+          isTrue,
+          reason: '"$code" is not a valid 2-3 letter language code',
+        );
+      }
+    });
+
+    test('every locale file has exactly the same keys as en.json', () {
+      final enData = json.decode(
+        File('$localizationsDir/en.json').readAsStringSync(),
+      ) as Map<String, dynamic>;
+      final referenceKeys = extractLeafKeys(enData);
+
+      for (final file in jsonFiles) {
+        final name = p.basename(file.path);
+        if (name == 'en.json') continue;
+
+        final data = json.decode(file.readAsStringSync())
+            as Map<String, dynamic>;
+        final fileKeys = extractLeafKeys(data);
+
+        final missing = referenceKeys.difference(fileKeys);
+        final extra = fileKeys.difference(referenceKeys);
+
+        expect(
+          missing,
+          isEmpty,
+          reason: '$name is missing keys: $missing',
+        );
+        expect(
+          extra,
+          isEmpty,
+          reason: '$name has extra keys not in en.json: $extra',
+        );
+      }
+    });
+  });
+
+  // ── Group 2: t() translation lookup ───────────────────────────────────
+
+  group('t() translation lookup', () {
+    late Map<String, dynamic> enData;
+
+    setUpAll(() {
+      enData = json.decode(
+        File('$localizationsDir/en.json').readAsStringSync(),
+      ) as Map<String, dynamic>;
+    });
+
+    test('simple nested key lookup', () {
+      expect(
+        LocalizationService.lookup(enData, 'app.title'),
+        equals('DeFlock'),
+      );
+    });
+
+    test('deeper nested key lookup', () {
+      expect(
+        LocalizationService.lookup(enData, 'actions.cancel'),
+        equals('Cancel'),
+      );
+    });
+
+    test('missing key returns the key string as fallback', () {
+      expect(
+        LocalizationService.lookup(enData, 'this.key.does.not.exist'),
+        equals('this.key.does.not.exist'),
+      );
+    });
+
+    test('single {} parameter substitution', () {
+      expect(
+        LocalizationService.lookup(enData, 'node.title', params: ['42']),
+        equals('Node #42'),
+      );
+    });
+
+    test('multiple {} parameter substitution', () {
+      expect(
+        LocalizationService.lookup(enData, 'proximityAlerts.rangeInfo',
+            params: ['50', '500', 'm', '200']),
+        equals('Range: 50-500 m (default: 200)'),
+      );
+    });
+
+    test('partial path resolving to a Map returns the key as fallback', () {
+      expect(
+        LocalizationService.lookup(enData, 'actions'),
+        equals('actions'),
+      );
+    });
+  });
+}