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On the sign:
ÉLISA LEMONNIER 1805-1865 SAINT-SIMONIENNE A FONDÉ ICI LA PREMIÈRE ÉCOLE D’ENSEIGNEMENT PROFESSIONNEL POUR LES FEMMES
The sign is on the school founded by Élisa Lemonnier (1865-1805), who was a French educator and feminist. The school in question was the first school in France where women were given professional education. Claude-Henri de Saint-Simon is considered the founder of French socialism, and his teachings were espoused by Élisa Lemonnier (as indicated on the sign)