fix importer keyless translation error

unfortunately this error originally occured inside a rescue block
 for a media upload error (which should be fairly rare), so we won't
 be able reproduce it with any degree of reliability

closes #CNVS-20632

Change-Id: Ic3375f81d7ee4490ec55247a74ae67a29235ff7d
Reviewed-on: https://gerrit.instructure.com/54924
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>

app/models/importers.rb

@@ -15,9 +15,9 @@ module Importers
       attr_accessor :item_class
 
       # forward translations to CalendarEvent; they used to live there.
-      def translate(key, default, options = {})
+      def translate(*args)
         raise "Needs self.item_class to be set in #{self}" unless self.item_class
-        self.item_class.translate(key, default, options)
+        self.item_class.translate(*args)
       end
       alias :t :translate
 

spec/models/importers/course_content_importer_spec.rb

@@ -339,6 +339,10 @@ describe Course do
       Importers::CourseContentImporter.import_content(@course, data, params, migration)
     end
   end
+
+  it 'should be able to i18n without keys' do
+    Importers::CourseContentImporter.translate('stuff')
+  end
 end
 
 def from_file_path(path, course)