This will resolve issues in cases where the site locale may be assigned a value that does not have an explicit translation. E.g. if the locale is en_NZ (and it's appropriate for this to be the assigned locale), Afrikaans will no longer be the default selected locale when creating members. Now en_US is chosen as a better fallback default.
This is a minor ease of use fix that means fewer CMS users can be accidentally created in Afrikaans within NZ based sites.
Test cases included.
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