Display progress while deleting email messages

Add/use new print mode flag: P_ATCODES for use with trusted format params

Renamed text.dat strings (to better support translation/localization):
- Deleted -> DeletedUser
- Inactive -> InactiveUser

New text.dat strings:
- Deleting
- DoneDeleting
- Deleted
- DeletedNumberItems
- E_Mail
- E_Mails