Clock module does not appear

No, you shouldn’t, CMS will override this file next time there will be any change to this layout.
So you want something like that:

Could please go to settings->regional and change DEFAULT_LANGUAGE to ‘fr’ just fr not fr_FR and see if that change anything?

As you may imagine I tested it with other languages, obviously including French and it seems to work just fine. in default language you always want to have same name as .mo file with the translation. (or you can try to use detect language assuming your browser is set to French)
List of .mo files with different translations

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