fixed mailer language issue

app/controllers/admin/announcements_controller.rb

@@ -319,6 +319,7 @@ class Admin::AnnouncementsController < OrbitAdminController
         :create_user=>current_user,
         :mail_sentdate=>bulletin.email_sentdate,
         :module_app=>@module_app,
+        :mail_lang => I18n.locale,
         :mail_to=>bulletin.email_addresses,
         :mail_subject=>bulletin.title,
         :template=>'announcements/email',