Improve warning when exiting with unsaved changes #176
Description
Is your feature request related to a problem? Please describe.
The warning about unsaved changes when exiting SF2 doesn't clearly say that this means there are unsaved changes. A new user could mistakenly ignore it.
This happened with a user that saved a packed version and then exited SF2, thinking his changes were already saved.
Describe the solution you'd like
"Are you sure you want to exit the editor? There are unsaved changes that will be lost if you exit the editor now!"