deleted redundant print statements

backend/src/main/java/hu/pazmany/Controller.java

backend/src/main/java/hu/pazmany/Document.java

backend/src/main/java/hu/pazmany/Subject.java

backend/src/main/java/hu/pazmany/User.java

frontend/src/App.vue

frontend/src/components/browse-komponens.vue

frontend/src/components/header-komponens.vue

frontend/src/components/loginform-komponens.vue

frontend/src/components/register-komponens.vue