Notification system enhanced

- Base for notifcation center
- Show text in map if no data is available

frontend/src/app/notifications/notifications.component.ts

@@ -0,0 +1,25 @@
+import { AfterContentInit, Component, OnDestroy, OnInit } from '@angular/core';
+import { APIService } from '../api.service';
+
+@Component({
+  selector: 'app-notifications',
+  templateUrl: './notifications.component.html',
+  styleUrls: ['./notifications.component.scss']
+})
+export class NotificationsComponent implements OnInit, AfterContentInit, OnDestroy {
+
+  constructor(private api: APIService) { }
+
+  ngOnInit(): void {
+  }
+
+  ngAfterContentInit(): void {
+    this.api.showFilter = false;
+    console.log(this.api.showFilter);
+  }
+
+  ngOnDestroy(): void {
+    this.api.showFilter = true;
+  }
+
+}