message: [explore] fix cached tooltip
diff: @@ -23,14 +23,14 @@ class CacheLabel extends React.PureComponent {
  updateTooltipContent() {
  const cachedText = this.props.cachedTimestamp ? (
  <span>
  - t('Loaded data cached') <b>{moment.utc(this.props.cachedTimestamp).fromNow()}</b>
  + {t('Loaded data cached')}
  + <b> {moment.utc(this.props.cachedTimestamp).fromNow()}</b>
  </span>) :
  t('Loaded from cache');
  const tooltipContent = (
  <span>
  - {cachedText}.
  - {t('Click to force-refresh')}
  + {cachedText}. {t('Click to force-refresh')}
  </span>
  );
  this.setState({ tooltipContent });
  