🐛 Bug fixes

lib/translations/en_us.dart

@@ -380,4 +380,5 @@ const i18nEnglish = {
   'messageOutOfSyncCaption':
       'Since the App has entered the background, there may be a time difference between the message list and the server. Click to Refresh.',
   'messageHistoryWipe': 'Wipe local message history',
+  'unknown': 'Unknown',
 };

lib/translations/zh_cn.dart

@@ -346,4 +346,5 @@ const i18nSimplifiedChinese = {
   'messageOutOfSync': '消息可能与服务器脱节',
   'messageOutOfSyncCaption': '由于 App 进入后台，消息列表可能与服务器存在时差，点击刷新。',
   'messageHistoryWipe': '清除消息记录',
+  'unknown': '未知',
 };