message: Rename action buttons from song-license-request list card
diff: <div class="cardstack-message-card">
  - <div class="main-content">{{content.comment}}</div>
  - <div class="button-panel">
  - {{#unless content.isHandled}}
  - <button type="button" class="action-button" data-test-approve-button onclick={{action 'approve'}}>
  - Approve
  - </button>
  - <button type="button" class="action-button" data-test-deny-button onclick={{action 'deny'}}>
  - Deny
  - </button>
  - {{/unless}}
  - </div>
  + {{content.comment}}
  </div>
  \ No newline at end of file
  