Hints for korganizer in main

Hints

• metainfo-validation-hint
  Validation of the metainfo file yielded the following hint: The component summary should not end with a "." [KOrganizer è un'applicazione per il calendario e la pianificazione.]
• metainfo-validation-hint
  Validation of the metainfo file yielded the following hint: The component summary should not end with a "." [KOrganizer програма-календар для планування заходів.]