changes notification center icon (#37)

Author: FelixKirsch

src/app/base/components/header/header.component.html

@@ -82,10 +82,13 @@
             <div class="flex items-center justify-center">
                 <a [routerLink]="['/notification-center']" class="flex mr-6 tooltip tooltip-left"
                     data-tip="Notification center">
-                    <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor">
-                        <path
-                            d="M10 2a6 6 0 00-6 6v3.586l-.707.707A1 1 0 004 14h12a1 1 0 00.707-1.707L16 11.586V8a6 6 0 00-6-6zM10 18a3 3 0 01-3-3h6a3 3 0 01-3 3z" />
-                    </svg>
+                    <svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-bell" width="24"
+                        height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none"
+                        stroke-linecap="round" stroke-linejoin="round">
+                        <path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
+                        <path d="M10 5a2 2 0 0 1 4 0a7 7 0 0 1 4 6v3a4 4 0 0 0 2 3h-16a4 4 0 0 0 2 -3v-3a7 7 0 0 1 4 -6"></path>
+                        <path d="M9 17v1a3 3 0 0 0 6 0v-1"></path>
+                     </svg>
                 </a>
             </div>
             <div class="flex items-center justify-center">