In order to configure gnome-software to show specific apps in one region
without showing to all language speakers, we allow the storage of full
locales on the extra-languages key. However, these locales are ignored when
calling flatpak_installation_get_default_languages, so locales will be reduced
to their language identifier (eg. en_IN locale will be returned as 'en', and
az_Latn_AZ will be returned as 'az'). In order to get the full locales, we can
call flatpak_installation_get_default_locales instead, which can return languages
and locales.
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