Xampp Security is extremely buggy and has been removed from the latest Xampp Release therefore. Obviously you installed an older version, dont run "Security", you will definately destroy your installation.
The answer is easy: The security script cannot display the language specific fields because no language is chosen. And you cannot choose a language because the xampp splash page (as well as the whole old orange xampp administration page) is no longer included in current XAMPP versions. I guess that the security scripts are not removed too because Bitnami simply forgot it.
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