class Series:
    submitter = models.ForeignKey(Person, ...

Would result in Person having a field named series_set QuerySet that
represents the other side of this one-to-many relation.

related_name is used to overwrite that and it looks like it purpose was
misunderstood as it had been set to "submitters" - Person.submitters
doesn't make much sense.

Let's remove related_name an use the default name.

Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>