Add missing device action string for text (#82963)

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

homeassistant/components/text/strings.json

@@ -1,3 +1,8 @@
 {
-  "title": "Text"
+  "title": "Text",
+  "device_automation": {
+    "action_type": {
+      "set_value": "Set value for {entity_name}"
+    }
+  }
 }

homeassistant/components/text/translations/en.json

@@ -1,3 +1,8 @@
 {
+    "device_automation": {
+        "action_type": {
+            "set_value": "Set value for {entity_name}"
+        }
+    },
     "title": "Text"
 }