Furthermore, this is what you say about the interim appointment: 4. In the event of the absence or incapacity of the incumbent of any of the offices listed in section 2 or vacancy in any of these offices, the person appointed in the interim must meet the requirements set out in section 2.
Appointments do not necessarily take place every seven years. My understanding is that, if someone hands in their resignation, the person replacing them in the interim must be bilingual.