fix strings in places; add comments; updatea bit greek trnaslation [now has 666 translated messages] 666!! that rocks

detect and print correct name for history nickname in pm. we could also as logger.jid_is_from_pm but that means asking again HD, so I chose asking gc_contacts (mem super faster)

remote_control to use exceptions.py and the latter to be included in POTFILES.in [please always do this when new files]