message: Make message separator more accessible.
diff: @@ -65,9 +65,9 @@ export default class DateSeparator extends React.Component<IProps> {
  render() {
  // ARIA treats <hr/>s as separators, here we abuse them slightly so manually treat this entire thing as one
  // tab-index=-1 to allow it to be focusable but do not add tab stop for it, primarily for screen readers
  - return <h2 className="mx_DateSeparator" role="separator" tabIndex={-1}>
  + return <h2 className="mx_DateSeparator" role="separator" tabIndex={-1} aria-label={this.getLabel()}>
  <hr role="none" />
  - <div>{ this.getLabel() }</div>
  + <div aria-hidden="true">{ this.getLabel() }</div>
  <hr role="none" />
  </h2>;
  }
  