Add a time stamp to the status message

Problem/Motivation

In standard Drupal a message stays there forever - until you reload the node. Even if you have saved it hours ago...

While multitasking with different things it can become intransparent as to when a node was e.g. last saved.
That can lead to data loss - when forgetting to save again (after editing while the status message is still dsplayed). Or to unnecessary re-saving of a node.

Steps to reproduce

Proposed resolution

Therefor it would be great to add a timestamp to the message and display it to the user.

Remaining tasks

User interface changes

API changes

Data model changes