Create special locale for test environment

So hopefully we'll notice if our fallback mechanism fails.

.env.development

@@ -5,6 +5,11 @@
 #
 #     cp .env.development .env.local
 
+# Locale for translation. Using a locale other than `en` tests the
+# successful fallback to `en`. You will also see up-to-date text used
+# in production
+LOCALE="en_AU"
+
 VERBOSE_QUERY_LOGS=true
 
 SECRET_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

.env.test

@@ -1,6 +1,9 @@
 # ENV vars for the test environment
 # Override locally with `.env.test.local`
 
+# Locale for translation.
+LOCALE="en_TEST"
+
 OFN_REDIS_JOBS_URL="redis://localhost:6379/2"
 
 SECRET_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

config/locales/en_TEST.yml

@@ -0,0 +1,12 @@
+# Test language file
+# ---------------------
+#
+# All production environments set their own locale. The source locale `en.yml`
+# is used as a fallback but no server is using it directly.
+#
+# Using this test locale reflects that setup more realistically and means that
+# we include fallback translations in our tests.
+#
+en:
+  # Overridden here due to a bug in spree i18n (Issue #870, and issue #1800)
+  language_name: "English" # Localised name of this language