Admin Login can performed also by pressing the Enter key (ref #223)

dmp-frontend/src/app/ui/auth/admin-login/admin-login.component.ts

-import { Component, OnInit } from '@angular/core';
+import { Component, OnInit, HostListener } from '@angular/core';
 import { Router } from '@angular/router';
 import { Credential } from '@app/core/model/auth/credential';
 import { AuthService } from '@app/core/services/auth/auth.service';
@@ -17,6 +17,10 @@ export class AdminLoginComponent extends BaseComponent implements OnInit {
 	public auth2: any;
 	public credential: Credential;
 
+	@HostListener('document:keydown.enter', ['$event']) onKeydownHandler() {
+		this.nativeLogin();
+	}
+
 	constructor(
 		private authService: AuthService,
 		private uiNotificationService: UiNotificationService,