title: Angular translate variable replacement
body: <p>I would like to use a variable in my translation but I don't know how to do it in my template.</p>
  
  <p>In my HTML template : </p>
  
  
  
  <pre><code> &lt;md-input-container class="md-block"&gt;
                  &lt;md-autocomplete md-no-cache="vm.noCache" 
                                      md-search-text="user.searchUser" 
                                      md-items="userItem in vm.querySearch(user.searchUser)" 
                                      md-item-text="userItem.display"
                                      md-selected-item-change="vm.selectedItemChange(userItem, user)"
                                      md-min-length="0"
                                      required&gt;
                      &lt;md-item-template&gt;
                          &lt;span md-highlight-text="user.searchUser" md-highlight-flags="^i"&gt;{{userItem.display}}&lt;/span&gt;
                      &lt;/md-item-template&gt;
                      &lt;md-not-found&gt;
                          {{ 'user.autocomplete.no_user' | translate:'{ username: user.searchUser }' }}
  
                      &lt;/md-not-found&gt;
                  &lt;/md-autocomplete&gt;
              &lt;/md-input-container&gt;
  </code></pre>
  
  <p>and my translation file (json) :</p>
  
  
  
  <pre><code>"user": {
              "autocomplete": {
          "no_user" : "No user has been found ({{username}})",
       }
  }
  </code></pre>
  
  <p>How can I use user.searchUser to show that message ? </p>
  
  <p>Thank very much !</p>