Add missing strings to sensor integration (#90475)

* Add missing strings to sensor integration

* Enumeration

* Apply suggestion

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

---------

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

homeassistant/components/sensor/strings.json

@@ -160,6 +160,9 @@
     "energy_storage": {
       "name": "Stored energy"
     },
+    "enum": {
+      "name": "[%key:component::sensor::title%]"
+    },
     "frequency": {
       "name": "Frequency"
     },
@@ -235,6 +238,9 @@
     "temperature": {
       "name": "Temperature"
     },
+    "timestamp": {
+      "name": "Timestamp"
+    },
     "volatile_organic_compounds": {
       "name": "VOCs"
     },