Improve French accents and translation quality in config_fr.xml (doxygen#12138)

* Improve French accents and translation quality in config_fr.xml

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* Fix verb/PP disambiguation errors from code review

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* Fix incorrectly translated enum value name and Doxygen command reference

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* Fix remaining accents: icône, en-tête, représente, implémente, and 40+ more

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* Fix more accents: matières, mélanger, compatibilité, formaté, réservé, and more

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* Fix agreement errors: aide compressée, trouvé, basé sur CLI

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Author: Copilot