Add a language zh_code & Adjust languages (#725)

* Add language zh_code & Adjust some language

* Update lang_pt.lua

main.lua

@@ -389,6 +389,7 @@ LANG.init('zh',
         id=require'parts.language.lang_id',
         ja=require'parts.language.lang_ja',
         symbol=require'parts.language.lang_symbol',
+        zh_code=require'parts.language.lang_zh_code',
         --1. Add language file to LANG folder;
         --2. Require it;
         --3. Add a button in parts/scenes/lang.lua;