Default GUI language.
+`mac_prefix`: `(?^i:[a-f0-9]{2}(?::[a-f0-9]{2}){0,2}:?)` ::
+
+Prefix for autogenerated MAC addresses.
+
`max_workers`: `integer (1 - N)` ::
Defines how many workers (per node) are maximal started on actions like 'stopall VMs' or task from the ha-manager.