message: Header: themes supported
diff: +@import '../../styles/scheme.css';
  @import '../../styles/constants.css';
  .Header {
  }
  .Header--level-1 .Header__content {
  - color: var(--black);
  + color: var(--text_primary);
  font-size: 17px;
  line-height: 20px;
  font-weight: 500;
  }
  .Header--level-2 .Header__content {
  - color: var(--caption-gray);
  + color: var(--text_secondary);
  font-size: 13px;
  line-height: 15px;
  font-weight: 600;
  