Fixed two minor i18n issues

oscar/apps/catalogue/reviews/views.py

 from django.db.models import Avg
 from django.contrib import messages
 from django.db.models import get_model
+from django.utils.translation import ugettext_lazy as _
 
 from oscar.core.loading import get_classes
 SignedInUserProductReviewForm, AnonymousUserProductReviewForm, VoteForm = get_classes(

oscar/templates/checkout/shipping_methods.html

 {% extends "checkout/checkout.html" %}
 {% load currency_filters %}
+{% load i18n %}
 
 {% block title %}
 {% trans "Shipping method" %} | {{ block.super }}