#3299 - Add URI redirect for missing translations

modules/web/templates/site.conf.erb

 root /var/www/<%= @vhost %>;
 index index;
 default_type text/html;
 charset utf-8;
 
 set $index_page "index";
 
 <% if @custom_config %>
   <%= @custom_config %>
 <% end %>
@@ skipping 36 matching lines @@
     rewrite ^(.*) /en$1 last;
   }
 
   # Redirect server/language root
 
   rewrite ^/$ /$index_page last;
   rewrite ^/(\w\w(_\w\w)?)$ /$1/ permanent;
   rewrite ^/(\w\w(_\w\w)?)/$ /$1/$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 %>
   {
     fastcgi_pass unix:/tmp/multiplexer-fastcgi.sock;
     include /etc/nginx/fastcgi_params;
   }
   <% end %>
 <% end %>