Add missing French translations for CRUDEvent model

[nedagilanian]

Summary

This PR adds the missing French (fr) translations for the CRUDEvent model in django.po.

Changes

• Added translations for fields like user, action, timestamp,...

Closes #325

[jangus03]

I think you're still missing some translations. E.g.
(M2M_ADD, _('Many-to-Many Add')), (M2M_ADD_REV, _('Reverse Many-to-Many Add')), (M2M_REMOVE, _('Many-to-Many Remove')), (M2M_REMOVE_REV, _('Reverse Many-to-Many Remove')), (M2M_CLEAR, _('Many-to-Many Clear')), (M2M_CLEAR_REV, _('Reverse Many-to-Many Clear')),

[nedagilanian]

Thanks for the feedback! I've added the missing translations for the M2M actions