Fixed i18n string format error
Fixed i18n string format error

Because of the missing "s"s after "%(abc)", `ValueError: incomplete
format` was getting raised. This fixes that.

artefactual/archivematica-fpr-admin,artefactual/archivematica-fpr-admin,artefactual/archivematica-fpr-admin,artefactual/archivematica-fpr-admin