Uniformed vibration pattern dialog creation code to the code used in ChatProfileActivity and UserProfileActivity.
Added italian translation for "Enabled" and "Disabled" strings.
Notification and vibration per-chat or per-user settings have been reimplemented as single item choice, with current value selected on dialog show. When user chooses the "Default" option, the corresponding preference is deleted from the app configuration.
Vibration speed and count can be now set on a per-chat basis