title: Non-breaking space in Flutter arb file
body: <p>I am trying to add the non-breaking space in my <code>arb</code> file in Flutter app, however, I can't find any way to put the Unicode characters to the <code>arb</code> file.</p>
  <p>I need something like:</p>
  <pre><code>{
    &quot;@@locale&quot;: &quot;en&quot;,
    &quot;helloWorld&quot;: &quot;Hello&amp;nbsp;world!&quot;,
  }
  </code></pre>
  <p>Is it possible to add custom characters other than <code>\n</code> etc to <code>arb</code> files?</p>