upload i18n update file.

assets/i18n/en-US.json

@@ -391,6 +391,10 @@
         "other": "{} are typing..."
     },
     "settingsAppearance": "Appearance",
+    "settingsThemeMode": "Theme Mode",
+    "settingsThemeModeSystem": "System",
+    "settingsThemeModeLight": "Light",
+    "settingsThemeModeDark": "Dark",
     "settingsServer": "Server",
     "settingsBehavior": "Behavior",
     "settingsDesktop": "Desktop",

assets/i18n/zh-CN.json

@@ -391,6 +391,10 @@
         "other": "{} 正在输入……"
     },
     "settingsAppearance": "外观",
+    "settingsThemeMode": "主题模式",
+    "settingsThemeModeSystem": "跟随系统",
+    "settingsThemeModeLight": "浅色",
+    "settingsThemeModeDark": "深色",
     "settingsServer": "服务器",
     "settingsBehavior": "行为",
     "settingsDesktop": "桌面",
@@ -1076,4 +1080,4 @@
     "recycledFilesDeleted": "被回收文件成功删除",
     "failedToDeleteRecycledFiles": "删除被回收文件失败",
     "upload": "上传"
-}
+}