Improve message the user gets when (in the CM) he tries to edit a document that is not part of the current project

Currently we display following message:

Document is not part of project 'asas'. Add it to the project to be able to edit it here.

Only option is to add document to the project or cancel. There should be a third option to just edit document:
this is quite convenient if you spot a typo or something.
(There should be at least a link to open document in document type editor. 

[Carolien de Kort] as explained in the comments: don't want to add a link / button to change context. Documentation describes what to do in this situation, but perhaps the message could be clearer. Change the message text to:

Document is not part of project '<projectname'>. Add it to the project (or switch to Core) to be able to edit it.