Add translation strings for unsupported OS version (#149837)

Author: mdegat01

homeassistant/components/hassio/strings.json

@@ -225,6 +225,10 @@
     "unsupported_virtualization_image": {
       "title": "Unsupported system - Incorrect OS image for virtualization",
       "description": "System is unsupported because the Home Assistant OS image in use is not intended for use in a virtualized environment. Use the link to learn more and how to fix this."
+    },
+    "unsupported_os_version": {
+      "title": "Unsupported system - Home Assistant OS version",
+      "description": "System is unsupported because the Home Assistant OS version in use is not supported. Use the link to learn more and how to fix this."
     }
   },
   "entity": {