code: function _changeContent(popupTableUtils) {
    const POPUP_CONTENT = [
      `<button type="button" class="te-table-add-row">${i18n.get('Add row')}</button>`,
      `<button type="button" class="te-table-add-col">${i18n.get('Add col')}</button>`,
      `<button type="button" class="te-table-remove-row">${i18n.get('Remove row')}</button>`,
      `<button type="button" class="te-table-remove-col">${i18n.get('Remove col')}</button>`,
      '<hr/>',
      `<button type="button" class="te-table-merge">${i18n.get('Merge cells')}</button>`,
      `<button type="button" class="te-table-unmerge">${i18n.get('Unmerge cells')}</button>`,
      '<hr/>',
      `<button type="button" class="te-table-col-align-left">${i18n.get('Align left')}</button>`,
      `<button type="button" class="te-table-col-align-center">${i18n.get('Align center')}</button>`,
      `<button type="button" class="te-table-col-align-right">${i18n.get('Align right')}</button>`,
      '<hr/>',
      `<button type="button" class="te-table-remove">${i18n.get('Remove table')}</button>`
    ].join('');
    const $popupContent = $(POPUP_CONTENT);
  
    popupTableUtils.setContent($popupContent);
  }
docs: Change contextmenu content.
  @param {object} popupTableUtils - PopupTableUtils instance for managing contextmenu of table
  @private