title: Override the moment js default invalid date text
body: <p>How can I override the moment.js</p>
  
  <pre><code>var defaultInvalidDate = 'Invalid date';
  </code></pre>
  
  <p>without changing the moment.js file. Just like my site overrides certain bootstrap css styles with a Site.css, so when bootstrap is updated I dont lose the changes, is there any way to make overrides for momentjs?</p>
  
  <p>Thanks in advance</p>