Describe the bug

The homepage for this application has a broken link below the Contribute heading which doesn't link to any page.

To Reproduce

1. Go to http://world.openfoodfacts.localhost/

2. On the main page, click on the link below the contribute heading(adding a product with our app for iPhone or Android) which leads to http://world.openfoodfacts.localhost/open-food-facts-mobile-app
   

3. The result is a page that displays "Error, Invalid address".
   

Expected behavior

It should show some content related to this link.