@YGYL
1. For other language than English or French you have to:
1.1 Extract sh3p file in a folder (in fact is a jar file);
1.2 Go to /RoomsInfo/roomsinformations/ApplicationPlugin.properties;
1.3 Copy and save as ApplicationPlugin_zh_CN.properties
1.4 Make translation and converting them to ASCII encoding;
1.5 Pack back as jar and than change the extension in sh3p.
For more information about translations read this page .

2. In my country is also used the metric system.
I've test again the plugin and if I change the unit in general preferences it change also in plugin.
So, please try again to set unit to meter, centimeter or millimeter.