I improved the screenshots section with some screen shots from the users. Please check the corresponding section on the FET homepage.
I just saw now the screenshots - first collection, English, the teachers' constraints. There is something like a bug there, there are missing the locked/unlocked icons for constraints teacher(s) max hours daily with an activity tag. In the left of these 2 constraints there should be appear a locked icon (or unlocked, if you unlocked this facility).
Is it because of the screenshot capture program?
Other users, can you see these icons correctly? They should appear for
teacher(s) and students (set) max hours daily with an activity tag and for
students max gaps per day (in time constraints menu or shortcuts tab).
The missing icons is a bug of FET under GNOME, I fixed it in the latest FET snapshot (http://lalescu.ro/liviu/fet/download/test/).