Rails - Jul 2009 - add a new locale using raul's translate_routes plug-in

I just started using Raul Murciano''s translate_routes plug-in.
It''s
great. Now what I can''t understand is how to add a new locale (in my
case, French). I figured that I could just add a new section to my
translation file (text.yml). I appended the following to the text.yml
file:

fr:
  back: retourner

Then in my application layout (which I copied from Raul''s demo
application), I changed the code from:

<%= I18n.locale == ''es'' ? link_to(''en'',
:locale => ''en'') : link_to
(''es'', :locale => ''es'') %>

to:

<%= I18n.locale == ''fr'' ? link_to(''en'',
:locale => ''en'') : link_to
(''fr'', :locale => ''fr'') %>

When I run my application, I get this error:

No route matches {:action=>"index", :locale=>"fr"}

So, I''m guess I''ve got to make a change somewhere else for the
application to recognize this new route. What am I missing?