title: Remove <br> from column headers in tabulator xlsx export
body: <p>I am using <a href="http://tabulator.info/" rel="nofollow noreferrer">Tabulator</a> as frontend table framework in my browser. Some of my columns have long titles and are splitted by html line breaks (<code>&lt;br&gt;</code>).</p>
  <p>When I <a href="http://tabulator.info/docs/4.0/download#xlsx" rel="nofollow noreferrer">download the table data in Excel file format</a>, my column headers (= first row in this spreadsheet export) contain those <code>&lt;br&gt;</code> as plain text, e.g.: <code>Foo&lt;br&gt;bar</code>.</p>
  <p>How can I remove these characters in my excel export? Is this even possible? Any ideas?</p>
  <p><strong>EDIT</strong></p>
  <p>Here a screenshot from my Excel export for clarification:
  <a href="https://i.stack.imgur.com/YDG14.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YDG14.jpg" alt="Tabulator Column Headers in Excel" /></a></p>