Update Language.de.xml

[Mr-Update]

• Translation completed

[idrassi]

@Mr-Update
Before merging, I have comments.

In MACOSX_APFS_SYNTHESIZED_DEVICE, the placeholder {1} is already generated by the code with a leading space when a recommended physical store path is available, so the German string shouldn't add another space before it:

  `Wählen Sie stattdessen die physische APFS-Speicherpartition{1} aus.`

Also, for MACOSX_APFS_SYSTEM_STORE: "APFS-Speicherort" may be misleading because Apple/diskutil uses "APFS Physical Store" for the storage object backing an APFS Container, not for a general location/path: https://keith.github.io/xcode-man-pages/diskutil.8.html

Apple German Disk Utility documentation also uses APFS terms such as Container, Volume, and APFS-Partition in this context: https://support.apple.com/de-de/guide/disk-utility/dskutl1005/mac

So it looks like "physische APFS-Speicherpartition" is better in this context.