RSpec: Ensure that locales are present for i18n-js

spec/support/i18n_export.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+RSpec.configure do |config|
+  config.before(:suite) do
+    # In local development, we do not want to precompile assets explicitly.
+    # Therefore, we might need to export the translations before running the tests.
+    system('bundle exec i18n export') if ENV['CI'].blank?
+  end
+end