Rails 4: Using locales in a sub-URI app with Passenger/NGINX - ruby-on-rails

Question

I have an app that lives in a sub-URI, http://myhost/app2. I'm having a hard time figuring out how I can configure the proper locale routing for this.
I've put this in routes.rb I've tried with both:
Rails.application.routes.draw do
get '' => redirect("/#{I18n.default_locale}")
scope "/:locale", locale: /#{I18n.available_locales.join("|")}/ do
root 'index#home'
end
end
as well as:
Rails.application.routes.draw do
prefix = Rails.application.config.relative_url_root
get "#{prefix}" => redirect("#{prefix}/#{I18n.default_locale}")
scope "#{prefix}/:locale", locale: /#{I18n.available_locales.join("|")}/ do
root 'index#home'
end
end
In my production.rb file, I have: config.relative_url_root = "/app2"
My nginx.conf file (taken from the Phusion Passenger docs):
http {
...
server {
...
location ~ ^/app2(/.*|$) {
alias /home/dani/app2/public$1;
passenger_base_uri /app2;
passenger_app_root /home/dani/app2/;
passenger_document_root /home/dani/app2/public/;
passenger_enabled on;
}
}
}
When I try accessing http://myhost/app2 in production, I get a Rails error page that says "The page you were looking for doesn't exist."
My production.log file looks like this with every request I make:
I, [2014-09-01T12:22:56.050499 #15230] INFO -- : Started GET "/app2" for myipaddress at 2014-09-01 12:22:56 -0400
I looked at the nginx access.log file and I see the following:
[01/Sep/2014:12:26:04 -0400] "GET /app2 HTTP/1.1" 301 91 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Firefox/31.0"
[01/Sep/2014:12:26:04 -0400] "GET /en HTTP/1.1" 404 1351 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Firefox/31.0"
So redirection from /app2 to /en is occurring but myhost/en doesn't resolve to anything on this setup, it should be myhost/app2/en.
Any advice would be helpful.
Note: Everything works fine in development.