Password encryption

backend/data/accounts.json

@@ -2,7 +2,6 @@
   "data": [
     {
       "username": "hagemeister93",
-      "password": "Xjt3qb5t",
       "email": "hagemeister93@gmail.com",
       "firstName": "Laurin",
       "lastName": "Hagemeister",
@@ -24,7 +23,6 @@
     },
     {
       "username": "katjaStoiber",
-      "password": "target123",
       "email": "k.stoiber@uni-hannover.de",
       "firstName": "Katja",
       "lastName": "Stoiber",
@@ -46,7 +44,6 @@
     },
     {
       "username": "oetkerohnek",
-      "password": "iloveyou",
       "email": "oetker30625@gmx.com",
       "firstName": "Luna",
       "lastName": "Oeter",
@@ -74,7 +71,6 @@
     },
     {
       "username": "duranduran",
-      "password": "H4nn0ver",
       "email": "dduran@hannover.de",
       "firstName": "Jürgen",
       "lastName": "Durand",
@@ -102,7 +98,6 @@
     },
     {
       "username": "guitarhero",
-      "password": "gwerty123",
       "email": "guitarheroFurti@gmail.com",
       "firstName": "Frederik",
       "lastName": "Furtwängler",
@@ -124,7 +119,6 @@
     },
     {
       "username": "herbstMareike",
-      "password": "qhsrbpgrs",
       "email": "m.herbst@uni-hannover.de",
       "firstName": "Mareike",
       "lastName": "Herbst",
@@ -146,7 +140,6 @@
     },
     {
       "username": "seibertmitb",
-      "password": "{jkz+WvQe",
       "email": "janna-seibert@yahoo.com",
       "firstName": "Janna",
       "lastName": "Seibert",