title: Flutter rich text international
body: <p>I use intl package to internationalize my app, but a problem comes to me.</p>
  
  <p>There is a string for English and Chinese:  </p>
  
  <ul>
  <li>English version: <code>"has $num"</code></li>
  <li>Chinese version: <code>"有$num个"</code></li>
  </ul>
  
  <p>Now I want to add some style to the <code>$num</code> part, e.g., set the number to red color.</p>
  
  <p>I thought I need to get the string by locale, process and split the string then convert it to TextSpans by myself.</p>
  
  <p>Is there any easier/cleverer way to do this?</p>