Fix. Android settings theme always show "Dark theme"

src/lang/cn.rs

@@ -349,6 +349,7 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Security", "安全"),
         ("Theme", "主题"),
         ("Dark Theme", "暗黑主题"),
+        ("Light Theme", ""),
         ("Dark", "黑暗"),
         ("Light", "明亮"),
         ("Follow System", "跟随系统"),