Option to see numeric remaining time of curren token

[marderbot]

Hi there, first time opening an issue so please correct if I do anything wrong.

I think it would be useful to have the possibility to see the remaining life time of a token in a numeric format in the command line and the gui. It could be useful for example to know when a token is going to expire or has expired and then change it in some random script that uses the token to authenticate. I could send a pull request with the changes if someone can point me to the necessary files.

Thanks for your time