Update init files to register more app with the app registre app as well as the backup app

apps/linking/__init__.py

@@ -1,18 +1,22 @@
 from __future__ import absolute_import
 
-from navigation.api import bind_links, register_sidebar_template
-from project_setup.api import register_setup
-from documents.models import Document
+from django.utils.translation import ugettext_lazy as _
+
 from acls.api import class_permissions
 from acls.permissions import ACLS_EDIT_ACL, ACLS_VIEW_ACL
+from backups.api import AppBackup, ModelBackup
+from app_registry import register_app, UnableToRegister
+from documents.models import Document
+from navigation.api import bind_links, register_sidebar_template
+from project_setup.api import register_setup
 
-from .models import SmartLink, SmartLinkCondition
-from .permissions import (PERMISSION_SMART_LINK_VIEW,
-    PERMISSION_SMART_LINK_DELETE, PERMISSION_SMART_LINK_EDIT)
 from .links import (smart_link_instances_for_document,
     smart_link_setup, smart_link_list, smart_link_create, smart_link_edit,
     smart_link_delete, smart_link_condition_list, smart_link_condition_create,
     smart_link_condition_edit, smart_link_condition_delete, smart_link_acl_list)
+from .models import SmartLink, SmartLinkCondition
+from .permissions import (PERMISSION_SMART_LINK_VIEW,
+    PERMISSION_SMART_LINK_DELETE, PERMISSION_SMART_LINK_EDIT)
 
 bind_links([Document], [smart_link_instances_for_document], menu_name='form_header')
 bind_links([SmartLink], [smart_link_edit, smart_link_delete, smart_link_condition_list, smart_link_acl_list])
@@ -31,3 +35,10 @@ class_permissions(SmartLink, [
     ACLS_EDIT_ACL,
     ACLS_VIEW_ACL
 ])
+
+try:
+    app = register_app('linking', _(u'Document linking'))
+except UnableToRegister:
+    pass
+else:
+    AppBackup(app, [ModelBackup()])