i18n: in french, fix typo
i18n: in french, fix typo

FrankSalad/django-recurrence,django-recurrence/django-recurrence,linux2400/django-recurrence,Nikola-K/django-recurrence,linux2400/django-recurrence,Nikola-K/django-recurrence,django-recurrence/django-recurrence,FrankSalad/django-recurrence