FET full changelog

Crash bugs fixed, when using one or more constraints of type teacher(s)/students (set) max mornings/afternoons per week (in the Mornings/Afternoons mode) with the max allowed mornings/afternoons per week set to zero (reported by Thái Chí Phuong).
Corrected a field in the Arabic translation, by Benahmed Abdelkrim.

An English field correction (reported by Vangelis Karafillidis).
Updated the Greek translation, by Vangelis Karafillidis.

An English field correction (reported by Vangelis Karafillidis).
Updated the Greek translation, by Vangelis Karafillidis.

Changed the license of the program to the GNU Affero General Public License version 3 (Volker Dirr suggested to remove the term 'or later').
Logic bugs fixed in the generation algorithm.
Added a new type of constraint, activities max total number of students in selected time slots (suggested by Furkan Kizilaslan). Unfortunately, this constraint might have a bad behavior in practice; we need to scrutinize it before using it, and use it only if strictly necessary.
Implemented additional keyboard shortcuts: Ctrl+Shift+T/S/R for teachers/students/rooms days horizontal timetables. Also, the user can enable some other keyboard shortcuts from the Settings > Interface menu: + for adding, M for modifying, Delete for removing, A for activating, D for deactivating, C for comments, U for up, J for down, and W for weights (suggested by Alami Mohammed).
Minor improvements.

Added a new and complete Turkish translation, by the newly assigned translator, Erdem Uygun (he was assisted by ChatGPT).
Updated the Vietnamese translation, which is now complete, by the newly assigned translator, Vũ Ngọc Thành (he was assisted by Gemini and ChatGPT).

Updated to Qt 6.10.0.
The constraints of types room max activity tags per day/real day/week, teacher(s)/students (set) max activity tags per day/real day, and teacher(s)/students (set)/activities occupy max sets of time slots from selection will now accept any maximum limit, not just 1 or 2 (suggested recently by moke, and suggested in the past by Thái Chí Phương and Vũ Ngọc Thành).
Code cleanup.
Updated the Italian translation, by Andrea Primiani.
Updated the Arabic translation, by Benahmed Abdelkrim.

Updated to Qt 6.9.3.
Added a new type of constraint, activity(ies) begin(s) or end(s) teachers'/students' day (suggested recently by Nelson Gomes, and suggested in the past by ghani1990, Ali Doussary, YOUSSEF HOUIET, Željko Vrabec, and maybe other users).
Added a new type of constraint, activities occupy max sets of time slots from selection (suggested recently by k3nt0n, and maybe by other users in the past). The maximum value can be chosen by the user to be 1 or 2.
Memory and speed improvements for the constraints of type teacher(s)/students (set) max single gaps in selected time slots, teacher(s)/students (set) occupy max sets of time slots from selection, and teacher(s)/students (set) pair of mutually exclusive sets of time slots.
Changed the 'selected' symbol (now it is ✓) and the colors for the constraints with selected/not selected slots (suggested by k3nt0n, and by other users in the past). Rodica Lalescu suggested the new colors.
Other minor improvements.

Corrected some instructions/documentation (reported by Yush Yuen).
Added the option to highlight the incompletely assigned teachers in the teachers' statistics, by comparing their target number of hours with their assigned list of activities (suggested by GUEFFAZ REDA).
Updated the Italian translation, by Andrea Primiani.

Corrected some instructions/documentation (reported by Yush Yuen).
Added the option to highlight the incompletely assigned teachers in the teachers' statistics, by comparing their target number of hours with their assigned list of activities (suggested by GUEFFAZ REDA).
Updated the Italian translation, by Andrea Primiani.

Timetable generation code improvements in the new constraints of type teacher(s)/students (set) max single gaps in selected time slots (found with the help of Yush Yuen).
Bug fix: the option '--printteachers=[true|false]' of FET-CL was not correctly recognized, because of a typo in the source code (reported by samloba).
The inactive items (activities, subactivities, time constraints, space constraints, and group activities in the initial order items) will have a corresponding color (suggested by GUEFFAZ REDA).