more FA5 stuff with small related refactoring

src/components/exporter/exporter.js

@@ -1,3 +1,10 @@
+import { library } from '@fortawesome/fontawesome-svg-core'
+import { faCircleNotch } from '@fortawesome/free-solid-svg-icons'
+
+library.add(
+  faCircleNotch
+)
+
 const Exporter = {
   props: {
     getContent: {