Canviat el camp teacher code per teacher id a la taula non lective lessons.
Corregida la traducció dels elements del menu que desapareixien.
Merge pull request #16 from oadan79/master

sync
Avoid errors when teacher have no lessons at one specific day!
Added tooltip example
Check attendance first page refined
Started development of check_attendance_classroom_group.php
First version on view with ace templte
Sync
Sync
Sync
Merge branch 'master' of https://github.com/acacha/ebre-escool