title: Laravel :values placeholder not working?
body: <p>I've created a custom validator for extensions:</p>
  
  <pre><code>Validator::extend('extension', function ($attribute, $file, $extensions, $validator) {
      $ext = strtolower(@$file-&gt;getClientOriginalExtension());
  
      return in_array($ext, $extensions);
  });
  </code></pre>
  
  <p>And the custom message:</p>
  
  <pre><code>'extension' =&gt; 'The :attribute must be a file of type: :values.',
  </code></pre>
  
  <p>It doesn't seem to replace the <code>:values</code> part.</p>
  
  <p>I've tried using the custom replace also without luck:</p>
  
  <pre><code>Validator::replacer('wtf', function ($message, $attribute, $rule, $parameters) {
      return 'show me something!!!!!';
  });
  </code></pre>
  
  <p>But this doesn't do anything either.</p>
  
  <p>What's missing?</p>