more FA5 stuff with small related refactoring

src/components/status_popover/status_popover.js

@@ -1,4 +1,10 @@
 import { find } from 'lodash'
+import { library } from '@fortawesome/fontawesome-svg-core'
+import { faCircleNotch } from '@fortawesome/free-solid-svg-icons'
+
+library.add(
+  faCircleNotch
+)
 
 const StatusPopover = {
   name: 'StatusPopover',

src/components/status_popover/status_popover.vue

@@ -27,7 +27,7 @@
         v-else
         class="status-preview-no-content"
       >
-        <i class="icon-spin4 animate-spin" />
+        <FAIcon icon="circle-notch" spin size="2x"/>
       </div>
     </div>
   </Popover>