Add a tooltip to explain the count change icons

Author: DingoEatingFuzz

ui/app/templates/components/scale-events-accordion.hbs

@@ -11,7 +11,10 @@
       </div>
       <div class="column is-2">
         {{#if a.item.hasCount}}
-          <span data-test-count-icon>
+          <span data-test-count-icon
+            class="tooltip"
+            aria-label="Count {{if a.item.increased "increased" "decreased"}} to {{a.item.count}}"
+          >
             {{#if a.item.increased}}
               {{x-icon "arrow-up" class="is-danger"}}
             {{else}}