bunch of minor fixes

back-office/app/models/category.rb

@@ -2,4 +2,18 @@ class Category < ActiveRecord::Base
   has_many  :sub_categories
   has_many :filter_criterias, as: :owner
   belongs_to :section
+
+  rails_admin do 
+    object_label_method do
+      :custom_cat_name
+    end
+  end
+
+  def custom_cat_name
+    return self.name if not self.section
+
+    section = self.section.name
+    "#{section} -> #{self.name}"
+  end
+
 end