Add untranslated messages file and update localization keys

- Added `untranslated.json` to track untranslated messages.
- Updated localization keys in various language files to use camelCase format for consistency.
- Modified `neighbours_screen.dart` to reference updated localization keys.

lib/l10n/app_localizations_zh.dart

@@ -1553,10 +1553,10 @@ class AppLocalizationsZh extends AppLocalizations {
   String get repeater_cliSubtitle => '发送命令到重复器';
 
   @override
-  String get repeater_neighbours => 'Neighbors';
+  String get repeater_neighbours => '邻居';
 
   @override
-  String get repeater_neighboursSubtitle => 'View zero hop neighbors.';
+  String get repeater_neighboursSubtitle => '查看零跳邻居。';
 
   @override
   String get repeater_settings => '设置';
@@ -2189,21 +2189,31 @@ class AppLocalizationsZh extends AppLocalizations {
   }
 
   @override
-  String get neighbors_ReceivedData => 'Received Neighbours Data';
+  String get neighbors_receivedData => '收到邻居数据';
 
   @override
-  String get neighbors_RequestTimedOut => 'Neighbours request timed out.';
+  String get neighbors_requestTimedOut => '邻居请求超时处理。';
 
   @override
   String neighbors_errorLoading(String error) {
-    return 'Error loading neighbors: $error';
+    return '加载邻居时出错：$error';
   }
 
   @override
-  String get neighbors_repeatersNeighbours => 'Repeaters Neighbours';
+  String get neighbors_repeatersNeighbours => '重复器邻居';
 
   @override
-  String get neighbors_noData => 'No neighbours data available.';
+  String get neighbors_noData => '没有可用的邻居数据。';
+
+  @override
+  String neighbors_unknownContact(String pubkey) {
+    return '未知$pubkey';
+  }
+
+  @override
+  String neighbors_heardAgo(String time) {
+    return '听到的时间：$time前';
+  }
 
   @override
   String get channelPath_title => '数据包路径';