Merge branch 'master' of https://gitlab.bht-berlin.de/s85708/web-frontend

my-app/package-lock.json

my-app/package.json

my-app/src/actions/AuthenticationActions.js

my-app/src/actions/UserManagementActions.js

my-app/src/components/CreateNewUser.js

my-app/src/components/DeleteUserModal.js

my-app/src/components/TopMenu.js

my-app/src/components/UserItem.js

my-app/src/reducer/RootReducer.js