Show dmi firmware version in the about page

settings/about.yml

@@ -51,4 +51,18 @@
           weight: 30
           type: info
           backend: hardwareinfo
-          key: distro
\ No newline at end of file
+          key: distro
+        - name: Firmware vendor
+          weight: 40
+          type: info
+          backend: sysfs
+          stype: string
+          key: /sys/class/dmi/id/bios_vendor
+          readonly: true
+        - name: Firmware version
+          weight: 50
+          type: info
+          backend: sysfs
+          stype: string
+          key: /sys/class/dmi/id/bios_version
+          readonly: true
\ No newline at end of file