Emit region-neutral keyboard signals
Download Device Class Definition for Human Interface Devices (HID)

https://www.usb.org/sites/default/files/documents/hid1_11.pdf

See section 6.2.1 HID Descriptor

bCountryCode 0x09 German

also see section E.4 (page 67)

E.4 HID Descriptor (Keyboard)
Part            Offset/Size  Description                                         Sample
                (Bytes)                                                          Value
----------------------------------------------------------------------------------------
bLength           0/1        Size of this descriptor in bytes.                    0x09
bDescriptorType   1/1        HID descriptor type (assigned by USB).               0x21
bcdHID            2/2        HID Class Specification release number
                             in binarycoded decimal—for example, 2.10 is 0x210).  0x101
bCountryCode      4/1        Hardware target country.                             0x00
bNumDescriptors   5/1        Number of HID class descriptors to follow.           0x01
bDescriptorType   6/1        Report descriptor type.                              0x22
wDescriptorLength 7/2        Total length of Report descriptor.                   0x3F