title: Twig interpolate variable into translated string
body: <p>I have a <strong>Sylius</strong> instance with translations file configured and properly working</p>
  
  <p>Right now just using a snippet like this in my <code>twig</code>:</p>
  
  <pre><code>{{ 'project.sylius.frontend.header.label'|trans }}
  </code></pre>
  
  <p>It retrieves the proper string from the <code>yaml</code> translation file:</p>
  
  <pre><code>project.sylius.frontend.header.title: Welcome here
  </code></pre>
  
  <p>What I want to know is, if there is the chance to store the strings with interpolation marks straight in the <code>yaml</code>, 
  something like this:</p>
  
  <pre><code>project.sylius.frontend.cart_number: you are going to buy %n candies
  project.sylius.frontend.delivery: delivery will be between the %whatever and %whatever
  </code></pre>
  
  <p>And how to pass the variable in the the <code>twig</code> file</p>