Fix device_state_attributes warnings and norwegian translation

custom_components/nordpool/sensor.py

@@ -371,7 +371,7 @@ def tomorrow(self) -> list:
         ]
 
     @property
-    def device_state_attributes(self) -> dict:
+    def extra_state_attributes(self) -> dict:
         return {
             "current_price": self.current_price,
             "average": self._average,

custom_components/nordpool/translations/nb.json

@@ -0,0 +1,25 @@
+{
+    "config": {
+        "title": "Nordpool",
+        "step": {
+            "user": {
+                "title": "Nordpool Sensor",
+                "description": "Opprett en Nordpool sensor",
+                "data": {
+                    "region": "Region",
+                    "currency": "NOK",
+                    "VAT": "Inkluder MVA",
+                    "precision": "Antall desimaler som vises",
+                    "low_price_cutoff": "Grense for lav-pris",
+                    "price_in_cents": "Pris i cent",
+                    "price_type": "Pris i format",
+                    "additional_costs": "Mal for tilleggskostnader"
+                }
+            }
+        },
+        "error": {
+            "name_exists": "Navnet eksisterer allerede",
+            "invalid_template": "Malen inneholder feil, se https://github.com/custom-components/nordpool"
+        }
+    }
+}