title: Angular $localize using dynamic translation ID
body: <p>With new Angular 9 <em>@angular/localize</em> is now possible to translate code directly from typescript.
   As its usage is not officially well documented, I found some tips
  <a href="https://blog.ninja-squad.com/2019/12/10/angular-localize/" rel="noreferrer">on this post</a>.</p>
  
  <pre><code>$localize`:@@my-trans-unit-id:` // IT WORKS
  </code></pre>
  
  <p>That works correctly when ID is directly passed to the function, but if I want ID to be dynamic (and pass a variable), it does not work, rendering ID without parsing nor translating.</p>
  
  <p>I tried it by passing the variable this way:</p>
  
  <pre><code>const id = "my-trans-unit-id";
  
  $localize`:@@${id}:`; // NOT WORKING
  $localize`:@@`+id+`:`; // NOT WORKING
  </code></pre>