Since `en` is considered as the main fallback for all locales
ensure that it is present in all environments.
Note: Setting `config.i18n.fallbacks` to `true` means use the default locale
which means that if a particular instance is not using an `en` based locale
(the parent `en` locale is automatically derived as a fallback) then `en` will
not be available as a fallback.
Otherwise, there are no log lines for any request, which makes it
impossible to find out anything about the app in production.
Obviously this increases the size of the log files but this has to be
dealt with log rotation. The data is our most important asset.
