discourse/lib/i18n/backend/fallback_locale_list.rb

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module I18n
module Backend
# Configure custom fallback order
class FallbackLocaleList < Hash
def [](locale)
fallback_locale = LocaleSiteSetting.fallback_locale(locale)
[locale, fallback_locale, SiteSetting.default_locale.to_sym, :en].uniq.compact
end
end
end
end