title: Angular i18n for attributes with select
body: <p>I have an element I want to translate using i18n from angular. The part that I want to translate is the matTooltip but the value is a select. I know that I have to use <code>i18n-matTooltip</code> to make it work. I should use this syntax <code>&lt;span i18n&gt;The author is {gender, select, male {male} female {female} other {other}}&lt;/span&gt;</code> from the docs but I get an error doing so. </p>
  
  <pre><code>Uncaught Error: Template parse errors:
  Parser Error: Missing expected : at column 9 in [{section.addTooltip, 
  select, test {test} test2 {test2} test3 {test3}}] in 
  ng:///AppModule/TestComponent.html@34:72 ("
      &lt;/div&gt; 
  </code></pre>
  
  <p>This is what my element looks like:</p>
  
  <pre><code>&lt;button mat-flat-button (click)="click()" 
      [matTooltip]="{section.addTooltip, select, test {test} test2 {test2} test3 
      {test3}}" matTooltipPosition="above" i18n-matTooltip&gt;
  </code></pre>
  
  <p>Am I missing something?</p>