[Person overview] Show multiple following absences as one absence
E. g., if a student is absent in the 1., 2. and 3. lesson, it should be displayed like "1.-3.".
We have to find out whether this is too complicate or fault-prone to implement.
E. g., if a student is absent in the 1., 2. and 3. lesson, it should be displayed like "1.-3.".
We have to find out whether this is too complicate or fault-prone to implement.