0.9,de-de — Genuine & Deluxe

: For older versions of Edge or Internet Explorer, users have modified the AcceptLanguage key under HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International to force these specific quality values.

The request refers to setting a language preference within a browser's Accept-Language header. 0.9,de-DE

You can manually configure this preference in your browser or through the Windows Registry to ensure websites default to German while still allowing fallback languages: : For older versions of Edge or Internet

: A typical optimized header for a German speaker who also knows English might look like: en-US,en;q=0.9,de-DE;q=0.8 . The value de-DE;q=0

The value de-DE;q=0.9 tells a website that is your preferred language, with a "quality value" (q) of 0.9. This value ranges from 0 to 1, where higher numbers indicate a stronger preference. How to use this feature

: Developers use these strings to test how their applications handle internationalization (i18n) and localization (l10n).