Code refactoring to simplify template data contexts (#55)

* Fix a search filter when no catalogs are returned
* Code refactoring to simplify templates
* Remove duplicated code
* Remove dead code
* More improvements, clean up and add featured items in homepage
* Fix a type and better page navigation

ram/bookshelf/models.py

@@ -224,6 +224,10 @@ class MagazineIssue(BaseBook):
                 "published."
             )
 
+    @property
+    def obj_label(self):
+        return "Magazine Issue"
+
     def preview(self):
         return self.image.first().image_thumbnail(100)