message: Add aria-labels to remove filter buttons
diff: {{#each filters as |filter|}}
  <div local-class='Sidebar__ActiveFilter'>{{filter.display}}</div>
  - <button class="{{filter.class}}" local-class="Sidebar__RemoveFilter" {{action 'removeFilter' filter.filter}}>
  + <button
  + class="{{filter.class}}"
  + local-class="Sidebar__RemoveFilter"
  + aria-label='Remove {{filter.display}} filter'
  + {{action 'removeFilter' filter.filter}}
  + >
  {{fa-icon 'times'}}
  </button>
  {{/each}}
  