Add latest changes from frontend branch

frontend/src/app/Services/auth.service.ts

@@ -1,7 +1,8 @@
 import { Injectable } from '@angular/core';
 import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { Observable } from 'rxjs';
-const AUTH_API = 'https://aktienbot.flokaiser.com/api/user/';
+const AUTH_API = 'https://gruppe1.testsites.info/api/user';
+
 const httpOptions = {
   headers: new HttpHeaders({ 'Content-Type': 'application/json' }),
 };
@@ -11,12 +12,25 @@ const httpOptions = {
 })
 export class AuthService {
   constructor(private http: HttpClient) {}
+
+  /**
+   * @param  {string} email
+   * @param  {string} password
+   * @returns Observable
+   */
   login(email: string, password: string): Observable<any> {
     return this.http.post(AUTH_API + '/login', {
       email,
       password,
     });
   }
+
+  /**
+   * @param  {string} email
+   * @param  {string} username
+   * @param  {string} password
+   * @returns Observable
+   */
   register(email: string, username: string, password: string): Observable<any> {
     return this.http.post(
       AUTH_API + '/register',