Merge branch '729-insert-open-hub-statistics-at-the-foot-of-the-imprint' into 'staging'

Resolve "Insert Open Hub statistics at the foot of the imprint"

Closes #729

See merge request arsnova/frag.jetzt!751

src/app/components/home/_dialogs/imprint/imprint.component.html

@@ -7,6 +7,11 @@
 <mat-dialog-content tabindex="0">
   <app-imprint-en *ngIf="currentLang=='en'"></app-imprint-en>
   <app-imprint-de *ngIf="currentLang=='de'"></app-imprint-de>
+  <iframe [src]="safeURL"
+          scrolling="no"
+          marginHeight="0"
+          marginWidth="0"
+          style="height: 220px; width: 370px; border: none"></iframe>
 </mat-dialog-content>
 
 <app-dialog-action-buttons

src/app/components/home/_dialogs/imprint/imprint.component.ts

 import { Component, OnInit } from '@angular/core';
 import { MatDialogRef } from '@angular/material/dialog';
+import { DomSanitizer, SafeResourceUrl } from '@angular/platform-browser';
 
 @Component({
   selector: 'app-imprint',
@@ -9,12 +10,17 @@ import { MatDialogRef } from '@angular/material/dialog';
 export class ImprintComponent implements OnInit {
   deviceType: string;
   currentLang: string;
+  safeURL: SafeResourceUrl;
 
-  constructor(private dialogRef: MatDialogRef<ImprintComponent>) {
+
+  constructor(private dialogRef: MatDialogRef<ImprintComponent>,
+              private sanitizer: DomSanitizer) {
   }
 
   ngOnInit() {
     this.currentLang = localStorage.getItem('currentLang');
+    this.safeURL = this.sanitizer
+      .bypassSecurityTrustResourceUrl('https://www.openhub.net/p/frag-jetzt/widgets/project_factoids_stats');
   }
 
   /**