Adding de-DE: This requires to add a line like that – where = separates the name displayed an the actual language code
German(DE)=de-DE
Galician=gl
German (Standard)=de
German(DE)=de-DE
German (Austrian)=de-at
German (Liechtenstein)=de-li
German (Luxembourg)=de-lu
German (Standard)=de
German (Swiss)=de-ch