More user-friendly access-denied page

[nworden]

When a user without access tries to go to an admin page, we should a) give them a more helpful error message and b) provide a logout link, for people who may have multiple accounts.

[kshithijiyer]

When a user without access tries to go to an admin page, we should a) give them a more helpful error message

What error message do you have in mind?

b) provide a logout link, for people who may have multiple accounts.

A big button in the middle of the page would be good?

Could you please explain on what has to be change to what to achieve this?