MWS: HTTP 404 error clicking "Profile" button for anonymous users

[Jermolene]

The label for the "Logout" button is also incorrect

Steps to reproduce:

1. Start with a fresh install of MWS
2. Run npm install and npm start
3. Visit http://127.0.0.1:8080/ in a browser
4. Click the button "Add Admin Account"
5. Enter suitable details for an admin account and click "Add User"
6. In a different browser, open http://127.0.0.1:8080/
7. Observe the text "Hello Guest", and the buttons "Profile" and "Logout"
8. Click the "Profile" button and observe the 404 error
9. Click "Logout" and observe that it actually leads to the login screen

cc @webplusai

[Jermolene]

Tests were performed with the commit ddfc8c4