title: Concatenate another string to the translation result in angular template using translate pipe
body: <p>I'm trying to have a title in my template that is a concatenation between 2 different strings, 1 would be a translation result, the other would be a variable that I have in may component</p>
  
  <p>Nothing really makes sense to do this in a single  tag, but I'm sure it have a workaround some were</p>
  
  <pre><code>&lt;h4 class="value"&gt;{{'master.' + translationTitleVar | translate }}+ ": " + var2 &lt;/h4&gt;
  </code></pre>
  
  <p>What is expected is when I have the translationTitleVar = "x2" and var2 = "world" and the translation key master.x2 = hello, I should get hello: world, but what I get is Hello: var2, which makes sense, how can I get it to print out hello: world</p>
  
  <p>TIA mates</p>