Respect Accept-Language when getting strings

Gemfile

@@ -56,3 +56,4 @@ gem 'newrelic_moped'
 gem 'unicorn'
 gem "rack-timeout", "0.1.0beta3"
 gem "i18n"
+gem "rack-contrib", :git => 'https://github.com/rack/rack-contrib.git', :ref => '6ff3ca2b2d988911ca52a2712f6a7da5e064aa27'

Gemfile.lock

@@ -35,6 +35,14 @@ GIT
   specs:
     voteable_mongo (0.9.3)
 
+GIT
+  remote: https://github.com/rack/rack-contrib.git
+  revision: 6ff3ca2b2d988911ca52a2712f6a7da5e064aa27
+  ref: 6ff3ca2b2d988911ca52a2712f6a7da5e064aa27
+  specs:
+    rack-contrib (1.2.0)
+      rack (>= 0.9.1)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -185,6 +193,7 @@ DEPENDENCIES
   nokogiri
   pry
   pry-nav
+  rack-contrib!
   rack-test
   rack-timeout (= 0.1.0beta3)
   rake

app.rb

@@ -63,6 +63,7 @@ Moped.logger.level = ENV["ENABLE_MOPED_DEBUGGING"] ? Logger::DEBUG : Logger::INF
 I18n.load_path += Dir[File.join(File.dirname(__FILE__), 'locale', '*.yml').to_s]
 I18n.default_locale = CommentService.config[:default_locale]
 I18n::Backend::Simple.send(:include, I18n::Backend::Fallbacks)
+use Rack::Locale
 
 helpers do
   def t(*args)

locale/x-test.yml

+x-test:
+  requested_object_not_found: "##x-test## requested object not found"
+  user_id_is_required: "##x-test## User id is required"
+  source_type_must_be_user_thread_or_other: "##x-test## Source type must be 'user', 'thread' or 'other'"
+  value_is_required: "##x-test## Value is required"
+  value_is_invalid: "##x-test## Value is invalid"
+  anonymous: "##x-test## anonymous"
+  blocked_content_with_body_hash: "##x-test## blocked content with body hash %{hash}"
+  param_must_be_a_non_negative_number: "##x-test## %{param} must be a non-negative number"
+  param_must_be_a_number_greater_than_zero: "##x-test## %{param} must be a number greater than zero"

spec/api/i18n_spec.rb

+require "spec_helper"
+
+describe "i18n" do
+  it "should respect the Accept-Language header" do
+    put "/api/v1/comments/does_not_exist/votes", {}, {"HTTP_ACCEPT_LANGUAGE" => "x-test"}
+    last_response.status.should == 400
+    parse(last_response.body).first.should == "##x-test## requested object not found"
+  end
+end