add new feature, initial fix of gds, improove internationalization,
clean code
Student informations saved at the first use with shared preferences, 
set student's departments, degree on find
edit GDS
import events attivitaDiStudio in agenda
frix clickcable spinner
major fix in gds (usability logic & layout)
integration agenda, modify attivitadistudio in agenda, fix modify in gds
remove unused adapters, adapter agenda in list attivitadistudio
fix layout gds details, fix loading at first time in sharedPref activity
onbackstack from set shared pref
add button for preferences
add menu multiple selection, fix bugs gds, toasts
fix
fix string ita
fix addGroup in gds
fix bugs
add icon for preference
permission management of events
refresh list of events after edit
minor fix in layout