Display more user-friendly messages

**Is your feature request related to a problem? Please describe.**
No

**Describe the solution you'd like**

In the multiple authenticator selection windows (if you enable more than 1 method of authentications), you will see a very technical (and internal) description of each method such as "default-authenticator-totp-setup" or "duo-push-2fa-setup" (in my case).

In the future release, it would be cool and more professional-looking if we could just customize the message ourself. I would like to have options to customize (add) text and images, icons, etc... which could potentially assign a external link to download the Apps if users did not have one to begin with. For example, I would have it displayed as:

"Authenticator Apps" (Google, Microsoft) - [ Logo of the app and Link to download]
"Duo Push" - [ Logo of the app and Link to download]