fix(app): Rename the title property of the uhk-message component (#460)

Renaming eliminate the default behaviour of the title attribute of the
HTML elements.

packages/uhk-web/src/app/components/uhk-message/uhk-message.component.html

@@ -3,7 +3,7 @@
          [ngClass]="{'spin-logo': rotateLogo}"
          src="assets/images/agent-icon.png"/>
     <div class="messages">
-        <h1> {{ title }} </h1>
+        <h1> {{ header }} </h1>
         <h2> {{ subtitle }} </h2>
     </div>
 </span>

packages/uhk-web/src/app/components/uhk-message/uhk-message.component.ts

@@ -7,7 +7,7 @@ import { Component, Input, ChangeDetectionStrategy } from '@angular/core';
     changeDetection: ChangeDetectionStrategy.OnPush
 })
 export class UhkMessageComponent {
-    @Input() title: string;
+    @Input() header: string;
     @Input() subtitle: string;
     @Input() rotateLogo = false;
 }