Make list item gray if feed disabled

frontend/src/app/component/einstellungen/einstellungen.component.css

@@ -25,3 +25,10 @@
   margin-right: auto;
   max-width: 800px;
 }
+
+.notActive {
+  background-color: white;
+  filter:alpha(opacity=50); /* IE */
+  opacity: 0.5; /* Safari, Opera */
+  -moz-opacity:0.50; /* FireFox */
+}

frontend/src/app/component/einstellungen/einstellungen.component.html

@@ -2,7 +2,7 @@
 <div class="content">
   <div class="text-center">
     <div class="container" *ngFor="let feed of feeds">
-      <div class="row feed-list-row">
+      <div class="row feed-list-row" [ngClass]="{'notActive': feed.active == false}">
         <div class="col-2 text-center padding-0 margin-auto">
           <img class="feed-icon" src="{{feed.icon}}" alt="Feed-Icon">
         </div>