First usable version based on AngularJS 2! Almost no converters yet, though.

app/app.component.html

@@ -1,3 +1,9 @@
-<div>
-    <den-inputarea></den-inputarea>
+<div *ngFor="let step of steps" class="wrapper">
+    <textarea class="input" (change)="update(step)" placeholder="Please enter your input ..."
+              [(ngModel)]="step.content">{{step.content}}</textarea>
+    <select class="conversion" (change)="convert(step, $event)">
+        <option id="-1">Select conversion ...</option>
+        <option *ngFor="let c of converters" id="{{c.getId()}}">{{c.getDisplayname()}}</option>
+    </select>
+    <div class="message" *ngIf="step.error">{{step.message}}</div>
 </div>