[session] Show token expiry time in a more Human friendly format

[viklund]

As a user
I don't want to do complex math to figure out when my token expires
So I can spend my precious, precious brain cycles on more important things.

Description

Currently token expiry is shown using HHH:MM:SS format, which is complicated to understand, especially when number of hours is more than 48, and also seconds is too fine grained.

Suggestion, following output:

• If more than a day: "in X days at 12:05"
• If less than a day "in 12 hours and 5 minutes (at 23:04)"
• If less than two hours "WARNING, token expires in only 1 hour and 43 minutes"

Demo

Demo the expiry time using three different tokens (expected demo time, 2 minutes).