Improve UX when logging in: Name for login-providers

[hmpf]

From the support-queue:

At the login page users are asked to select whether to use:

• B2ACCESS
• Dataporten

Please know that these probably mean nothing to most users. These mean something for people who set up the authentication. It would be good to have: "UiO/UiT/NTNU/UiB affilated? Please use this"

Easily fixed if we have good replacement text, maybe:

• International (B2ACCESS)
• Norway (Feide)