Index: modules/web/templates/site.conf.erb
===================================================================
--- a/modules/web/templates/site.conf.erb
+++ b/modules/web/templates/site.conf.erb
@@ -54,6 +54,23 @@
   rewrite ^/(\w\w(_\w\w)?)/$ /$1/$index_page last;
 }
 
+# http://hub.eyeo.com/issues/3299 Redirect missing translations to default
+location ~ ^/([a-z][a-z]\_[A-Z][A-Z])(/.+) {
+  if (!-e "$document_root$uri")
+  {
+		# if there is no /es_Mx/page, redirect to /es/page instead:
+		rewrite ^/([a-z][a-z])\_([A-Z][A-Z])(/.+) /$1$3 redirect;
+  }
+}
+
+location ~ ^/([a-z][a-z])(/.+) {
+  if (!-e "$document_root$uri")
+  {
+    # if there is no /es/page, redirect to /page instead:
+    rewrite ^/([a-z][a-z])(/.+) $2 redirect;
+  }
+}
+
 <% if @multiplexer_locations %>
   <% @multiplexer_locations.each do |location| %>
   location <%= location %>