If you try to run the editor in Chinese, you will get an error loading localized .xaml resource dictionary from file. The problem is in Engine\EditorResources\WPF\Localized\UnrealEd.CHN.xaml. The problem is that there are two entries for LandscapeEdit_Add_NewLayer. Do a search for LandscapeEdit_Add_NewLayer. Change the first one to LandscapeEdit_GizmoData and leave the second one as-is. That should fix the problem.