bug: when current month has less than 31 days in monthly recurring
bug: when current month has less than 31 days in monthly recurring

In such case, selecting the 31st cause the 1st to be shown in the
text.

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