Add common state "Stopped"

Author: NoRi2909

homeassistant/strings.json

@@ -135,6 +135,7 @@
       "open": "Open",
       "paused": "Paused",
       "standby": "Standby",
+      "stopped": "Stopped",
       "unlocked": "Unlocked",
       "yes": "Yes"
     },