As so often… the Mairie is the place to find the answers… 
and, so often, it’s the last place people think (or choose) to visit… 
EDIT: that is just a general observation of so many threads on the forum, not aimed at anyone or anything/any thread in particular.
Just to clarify. I am not involved in any alienation proceedings I happened to come across the term when reading a local town bulletin.
According to BBC , " kéké " is slang for ‘show-off’ (Macron and his sunglasses)
Does that count as an idiom?
And I would imagine everyone in the neighbourhood will continue to do whatever they did before. 
Yes what were those sunglasses about? I was always told that rude to wear sunglasses when giving a speech or addressing an audience, as people need to see your eyes to believe you.
Slight “conjunctivitis” according to the News which I read a couple of days ago IIRC
here’s today’s link
But not necessarily the Maire, a here today gone tomorrow entity, rather the professional secretary who sits alongside him.
This was brought home to me when once she made a mistake. It was a serious occasion, I was there just after Fran died to organise and pay for our double grave. After the preliminaries with Jean, the Maire, he handed over to her for the actualities. She made out a form that I was supposed to sign and pushed it across to me. As always I read it through first and noticed the glaring mistake, the surname upon it was nothing like ours. She knew the name well, no idea what was in her mind, but despite the occasion both Jean and I looked across at her and burst into laughter at her obvious discomfort. She made out another, correct, form without further reference to us. 
Quite so… the Maire is elected for 6 years…
Once elected there is a “course” so the Maire can understand the gist of things and further training is available (to a certain level) but the Mairie Staff are govt employees.
The Secretaire should/will have training/knowledge covering all sorts of govt/everyday things and larger Mairies will have specialists 
I’ve known Maires who might well say “yes” verbally to a query… but they omit to say “now go and see the Secretaire and make sure it’s all legal/correct”…. aaargh… 
My “judgy” go-to
and, re conjunctivitis… I have suffered with this… itchy, painful eye, red streaks/blobs. I don’t care whether experts say dark glasses are not necessary… I always wore my sunglasses (prescription) rather than my normal, everyday ones. Somehow my eye felt rested and I relaxed knowing my bloody-eye wasn’t obvious to the world in general.
Mr Macron has my sympathy and I hope his eye gets better quickly.
I’ve often thought of the tutoyer/vouvoyer connection with ye olde Englishe.
Your post prompted me to insert ‘thou, thee, thine, thy’ into google translate.
Comes out as ‘toi, toi, tien, ton’
reversing the process gives ‘you, you, hold, you’. Context…
Yorkshire also has ‘tha’ and ‘thi’,
And my nearest part of Derbyshire, then and now. I have explained it many times to French people. 
The only time I ever went to a football match it was Boxing Day and the crowd were shouting “th’art too full of Christmas pudding Waggy”.
Google translates to ‘que’ and ‘ce’.
Thou, thee and thine should work.
They do…
I’m just wondering if you have any more news about the "Alienation… " ??
I only ask as I have been catching-up on Council Minutes for meetings I have missed and, low and behold, there is a long discussion about a proposed “Alienation”