tracking selected country in GA

docs/GoogleAnalytics.js

@@ -17,4 +17,17 @@ class GoogleAnalytics {
                 'search_term': search_term
             });
     }
+
+    static countrySelected(country) {
+        gtag("event",
+            "select_item",
+            {
+                item_list_id: "countrySelect",
+                items: [
+                    {
+                        item_id: country,
+                    }
+                ]
+            });
+    }
 }