Add notification to footer-buttons to confirm

src/app/components/shared/footer/footer.component.ts

 import { Component, OnInit } from '@angular/core';
-import { AuthenticationService } from '../../../services/http/authentication.service';
 import { NotificationService } from '../../../services/util/notification.service';
 import { Router } from '@angular/router';
 import { MatDialog } from '@angular/material';
@@ -15,7 +14,6 @@ export class FooterComponent implements OnInit {
   dsgvoUrl = 'https://arsnova.thm.de/blog/datenschutzerklaerung/';
   imprUrl = 'https://arsnova.thm.de/blog/impressum/';
   constructor(
-    public authenticationService: AuthenticationService,
     public notificationService: NotificationService,
     public router: Router,
     public dialog: MatDialog
@@ -25,6 +23,9 @@ export class FooterComponent implements OnInit {
   }
 
   navToBlog() {
+    this.notificationService.show('Der Blog wird in einem neuen Fenster geöffnet', 'Okay!' , {
+      duration: 3000
+    });
     window.open(this.blogUrl, '_blank');
   }
   navToDSGVO() {

src/app/services/util/notification.service.ts

@@ -10,8 +10,8 @@ export class NotificationService {
   constructor(private snackBar: MatSnackBar) {
   }
 
-  show(message: string, config?: MatSnackBarConfig) {
+  show(message: string, action?: string, config?: MatSnackBarConfig) {
     // Delegate the message and merge the (optionally) passed config with the default config
-    this.snackBar.open(message, '', Object.assign({}, this.defaultConfig, config));
+    this.snackBar.open(message, action, Object.assign({}, this.defaultConfig, config));
   }
 }