A change has been made to how locales are handled for distributed apps.
A locale will only be available for a specific app configuration if the locale has been explicitly added to the app configuration.
Locales are specified via the
Enabled Locales field with one locale per line.
Any invalid locales will simply be ignored.
This has been necessary because the number of possible configuration and locale combinations meant that copying them all into the distributed app system was not feasible.
All locales are available for the default configuration and
en_GB is available
by default for all configurations.