BUGFIX: fallback to en translation when interpolation is missing

lib/freedom_patches/translate_accelerator.rb

@@ -16,9 +16,17 @@ module I18n
       k = [args, config.locale, config.backend.object_id]
       t = @cache.fetch(k) { found = false }
       unless found
-        t = @cache[k] = translate_no_cache(*args).freeze
+        begin
+          t = translate_no_cache(*args)
+        rescue MissingInterpolationArgument
+          options = args.last.is_a?(Hash) ? args.pop.dup : {}
+          options.merge!(locale: config.default_locale)
+          key = args.shift
+          t = translate_no_cache(key, options)
+        ensure
+          t = @cache[k] = t.freeze
+        end
       end
-
       t
     end