Improve the "some unsubmitted jobs are present and will be deleted" dialog when quitting the application

[bertfrees]

The dialog currently says:

Some unsubmitted jobs are present and will be deleted when closing this window.

In the case when the application is quit using ⌘Q or the tray menu item (i.e. not by closing the window) it would be more correct to say:

Some unsubmitted jobs are present and will be deleted when quitting the application.

[marisademeglio]

I think this isn't an issue anymore - it says "Jobs are going to be removed from the application. Do you want to proceed ?"