root: add links as a substitution variable, to make it available on all pages

extra/modules/root.ptl

@@ -740,6 +740,13 @@ class AlternateRootDirectory(OldRootDirectory):
     payment = PublicPaymentDirectory()
     invoices = InvoicesDirectory()
 
+    def get_substitution_variables(self):
+        d = {}
+        def print_links(fd):
+            fd.write(str(self.links()))
+        d['links'] = print_links
+        return d
+
     def _q_traverse(self, path):
         if get_publisher().has_site_option('drupal'):
             drupal.try_auth()
@@ -757,8 +764,11 @@ class AlternateRootDirectory(OldRootDirectory):
         response = get_response()
         if not hasattr(response, 'filter'):
             response.filter = {}
+
         response.filter['gauche'] = self.box_side(path)
         response.filter['keywords'] = template.get_current_theme().get('keywords')
+        get_publisher().substitutions.feed(self)
+
         response.breadcrumb = [ ('', _('Home')) ]
 
         if not self.admin: