diff --git a/lib/redmine/i18n.rb b/lib/redmine/i18n.rb
index a79b4fc68..c2beafefb 100644
--- a/lib/redmine/i18n.rb
+++ b/lib/redmine/i18n.rb
@@ -177,13 +177,11 @@ module Redmine
     # Custom backend based on I18n::Backend::Simple with the following changes:
     # * available_locales are determined by looking at translation file names
     class Backend < ::I18n::Backend::Simple
-      module Implementation
-        # Get available locales from the translations filenames
-        def available_locales
-          @available_locales ||= begin
-            redmine_locales = Dir[Rails.root / 'config' / 'locales' / '*.yml'].map { |f| File.basename(f, '.yml').to_sym }
-            super & redmine_locales
-          end
+      # Get available locales from the translations filenames
+      def available_locales
+        @available_locales ||= begin
+          redmine_locales = Dir[Rails.root / 'config' / 'locales' / '*.yml'].map { |f| File.basename(f, '.yml').to_sym }
+          super & redmine_locales
         end
       end