Localization/Chinese

* added support for locale 4
* some strings are missing and will need to be translated at a later date
* thx @qyh214 for a lot of content

Co-authored-by: qyh214 <sandy0214qin@msn.com>

localization/lang.class.php

@@ -388,6 +388,7 @@ class Lang
             LOCALE_EN => [',', '.'],
             LOCALE_FR => [' ', ','],
             LOCALE_DE => ['.', ','],
+            LOCALE_CN => [',', '.'],
             LOCALE_ES => ['.', ','],
             LOCALE_RU => [' ', ',']
         );