Edit the shop/base.html template of the shop application. Make sure that you load the i18n tag at the top of the template and mark strings for translation as follows:
{% load i18n %}{% load static %}<!DOCTYPE html><html><head> <meta charset="utf-8" /> <title> {% block title %}{% trans "My shop" %}{% endblock %} </title> <link href="{% static "css/base.css" %}" rel="stylesheet"></head><body> <div id="header"> <a href="/" class="logo">{% trans "My shop" %}</a> </div> <div id="subheader"> <div class="cart"> {% with total_items=cart|length %} {% if cart|length > 0 %} {% trans "Your cart" %}: <a href="{% url "cart:cart_detail" %}"> {% blocktrans with total_items_plural=total_items|pluralize total_price=cart.get_total_price ...