message: Header: added multiline prop
diff: .Header__main {
  min-width: 0;
  overflow: hidden;
  - white-space: nowrap;
  text-overflow: ellipsis;
  }
  align-items: baseline;
  }
  +.Header__content-base {
  + text-overflow: ellipsis;
  + white-space: nowrap;
  + overflow: hidden;
  +}
  +
  +.Header--multiline {
  + white-space: normal;
  +}
  +
  .Header__subtitle {
  color: var(--text_secondary);
  }
  .Header__indicator {
  color: var(--text_secondary);
  margin-left: 6px;
  + flex-shrink: 0;
  }
  .Header:not(.Header--pi) .Header__indicator {
  