fix i18n,reload problems

app/models/module_app.rb

@@ -6,7 +6,7 @@ class ModuleApp
 
   field :key
   field :title
-  field :sidebar_order#,type: Integer
+  field :sidebar_order,type: Integer,default: 0
 
   def refetch_setting!(reg)
     # %w{module_label category base_url version organization author intro update_info create_date}.each  do |field|
@@ -30,7 +30,7 @@ class ModuleApp
   end
 
   def get_default_widget
-    raise 'Need to link with OrbitApp [type: Array]'
+    get_registration.get_default_widget
   end