Correct HTTP500 error text

src/app/pages/500.component.html

@@ -5,7 +5,7 @@
         <div class="clearfix">
           <h1 class="float-left display-3 mr-4">500</h1>
           <h4 class="pt-3">Houston, we have a problem!</h4>
-          <p class="text-muted">The page you are looking for is temporarily unavailable.</p>
+          <p class="text-muted">Server connection unavailable.</p>
         </div>
         <span class="input-group-btn">
           <button class="btn btn-primary btn-lg" type="button"(click)="goBack()">Go Back</button>