message: Fix mobile add block button
diff: .add-block__placeholder Drop or #[span.add-block__placeholder__choose.pointer choose] files, paste a URL (image, video or link) or type text here
  fieldset
  textarea#grid__block--new-block__content-field.grid__block--new-block__content-field
  + .block-item__bottom-buttons
  button.grid__block--new-block__submit.button--inblock Add block &rarr;
  \ No newline at end of file
  