Although there is an option to publish "Translations for customers" this is only applied to the root "_index" file. Not for namespaces. Since all of our translation keys are assigned to a namespace our root "_index" is empty and so are the generate customer "_index_customer-a" files. For each namespace there is a "/namespace-xyz/_index" file generated which contains the translations. But the customer specific file "/namespace-xyz/_index_customer-a" is missing. Because of this, we have to fetch all translations via the API.
