More realistic test env for translations

Most production servers don't use the source locale `en`. Even if the
default language is English, they use a local variant like `en_AU` or
`en_GB` to customise some of the translations.

However the environment is configured, the app should always fallback to
`en` if no other translation is available.

.env

@@ -10,10 +10,10 @@ TIMEZONE="Melbourne"
 DEFAULT_COUNTRY_CODE="AU"
 
 # Locale for translation.
-LOCALE="en"
+LOCALE="en_AU"
 
 # For multilingual - ENV doesn't have array so pass it as string with commas
-AVAILABLE_LOCALES="en,es"
+AVAILABLE_LOCALES="en_AU,es"
 
 # Spree zone.
 CHECKOUT_ZONE="Australia"

spec/base_spec_helper.rb

@@ -141,7 +141,7 @@ RSpec.configure do |config|
 
   # Reset locale for all specs.
   config.around(:each) do |example|
-    I18n.with_locale(:en) { example.run }
+    I18n.with_locale(:en_AU) { example.run }
   end
 
   # Reset all feature toggles to prevent leaking.