Middleman’s link_to helper for localized templates - middleman

Question

For the site I'm building with Middleman, I am localizing entire templates as described in the docs on the bottom of the "Localization" section. So the relevant part of the file tree looks like this:
/localizable
|
|- index.en.html.haml
|- index.ru.html.haml
|- about.en.html.haml
|- about.ru.html.haml
I can link from the index.en page to the about.en page using the path helper like so:
= link_to 'about me', '/about.html'
But when I try to do a similar trick to create a link from the index.ru page to the about.ru page:
= link_to 'some russian text', '/russian/about.html'
the helper doesn't work. It ignores the /russian folder and creates a link to /about.html in root.
Am I missing something or is the path helper unusable for localized templates? Is the only option to use the <a> tag directly?
============
Update1: relevant parts of my config.ru file:
set :css_dir, 'stylesheets'
set :js_dir, 'javascripts'
set :images_dir, 'images'
activate :relative_assets
set :relative_links, true
activate :i18n, :langs => [:en, :ru], :lang_map => { :en => :english, :ru => :russian }
activate :blog do |blog|
blog.prefix = "blog"
blog.paginate = true
end
# Build-specific configuration
configure :build do
# For example, change the Compass output style for deployment
# activate :minify_css
# Minify Javascript on build
# activate :minify_javascript
# Enable cache buster
# activate :asset_hash
# Use relative URLs
# activate :relative_assets
# Or use a different image path
# set :http_prefix, "/Content/images/"
end

Answer 1

Cant really say what is the problem without seeing your config.rb file and the structure of your file system.
My guess on your problem would be like this here
or it could be real simple that you have to change 'russian' to 'ru', since that is in file name.
Here is a good example
EDIT:
Now with your config.rb , I can see you are using :en as default and :ru as russian
Since you are using :en as default(non prefixed), you dont have to map that. or if you want that to be mapped and not be default you might have to use ':mount_at_root => false' with activate 'activate :i18n,'
Try the following solution
activate :i18n, :langs => [:en,:ru], :lang_map => {:ru => :russian}
Like I said, I simply just removed :en mapping and it worked on my test. Since you make :en as default you dont have to map it. If you want both languages to be mapped correctly then use the following
activate :i18n, :mount_at_root => false, :langs => [:en,:ru], :lang_map => {:en => :english ,:ru => :russian}