config/application.rb: Update locales path

Allows [locale-code].yml files to be loaded
even in subdirectories of the 'config/locales' directory.

This allows us to keep things organized,
with one translation subdirectory per locale.

config/application.rb

@@ -20,5 +20,8 @@ class Application < Rails::Application
         resource "/api/*", headers: :any, methods: [:get, :post, :options]
       end
     end
+
+    # I18n stuff
+    config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '**', '*.{rb,yml}')]
   end
 end