Add validation for onMuteNotifications (#6092)

* Add aria-autocomplete='list' in Textaria

ref: https://www.w3.org/TR/wai-aria-1.1/#aria-autocomplete

* Make detect empty string brefore assign upload description

* Change code elements in keyboard-shortcuts component to kbd

* Add validation for onMuteNotifications

app/javascript/mastodon/components/account.js

@@ -27,6 +27,7 @@ export default class Account extends ImmutablePureComponent {
     onFollow: PropTypes.func.isRequired,
     onBlock: PropTypes.func.isRequired,
     onMute: PropTypes.func.isRequired,
+    onMuteNotifications: PropTypes.func.isRequired,
     intl: PropTypes.object.isRequired,
     hidden: PropTypes.bool,
   };