Added route translations for notifications.
Adding URL helpers for ITKs pages.

Specifically those related to registrering membership cards online in
order to gain user access and forgot password page.
Replaced admin login with member login.

The authentication page did not reflect the fact that memberships could
also log in and attend presentations. The page gave the impression that
membership login was just for administrator, which it was previously.

The authentication page now explains in more detail why there is two
login forms, which one to use and it provides useful links to ITKs pages
for registrering membership cards and resetting of membership passwords.
Markdownification of explanations. Marky mark.