Add state attribute translations for fans (#89816)

homeassistant/components/fan/strings.json

@@ -22,6 +22,30 @@
       "state": {
         "off": "[%key:common::state::off%]",
         "on": "[%key:common::state::on%]"
+      },
+      "state_attributes": {
+        "direction": {
+          "name": "Direction",
+          "state": {
+            "forward": "Forward",
+            "reverse": "Reverse"
+          }
+        },
+        "oscillating": {
+          "name": "Oscillating"
+        },
+        "percentage": {
+          "name": "Speed"
+        },
+        "percentage_step": {
+          "name": "Speed step"
+        },
+        "preset_modes": {
+          "name": "Available preset modes"
+        },
+        "preset_mode": {
+          "name": "Preset mode"
+        }
       }
     }
   }