Add strings for traccar config flow (#26089)

* Add strings for traccar config flow

* Update strings.json

homeassistant/components/traccar/strings.json

@@ -0,0 +1,18 @@
+{
+  "config": {
+    "title": "Traccar",
+    "step": {
+      "user": {
+        "title": "Set up Traccar",
+        "description": "Are you sure you want to set up Traccar?"
+      }
+    },
+    "abort": {
+      "one_instance_allowed": "Only a single instance is necessary.",
+      "not_internet_accessible": "Your Home Assistant instance needs to be accessible from the internet to receive messages from Traccar."
+    },
+    "create_entry": {
+      "default": "To send events to Home Assistant, you will need to setup the webhook feature in Traccar.\n\nUse the following url: `{webhook_url}`\n\nSee [the documentation]({docs_url}) for further details."
+    }
+  }
+}