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Fix project name capitalization in README #1006

Job	Run time
Construction (mkdocs build --strict)	29s
Paquets (deb installé, rpm vérifié)	1m 51s
Types (mypy)	25s
Tests GTK4 (Xvfb)	2m 48s
i18n (catalogues à jour)	53s
Qualité (lint, format, import-linter, tests)	2m 13s
	8m 39s