[Sync EN] Fix localeconv() function description (#5707)

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Commit: https://github.com/php/doc-en/commit/92367aee7c51055f62de8c85851ba57aaf3cce7c
PR: https://github.com/php/doc-en/pull/5707

Zu aktualisierende DE-Dateien

• reference/strings/functions/localeconv.xml