Revert code that broke changing language.

client/lib/i18n.js

@@ -22,10 +22,5 @@ Meteor.startup(() => {
       TAPi18n.setLanguage(language);
       T9n.setLanguage(language);
     }
-
-    if (language === 'zh') {
-      TAPi18n.setLanguage('zh_CN');
-      T9n.setLanguage('zh_CN');
-    }
   });
 });