Translate the following English sentence to French:
"Let us note in passing, with regard to vanguards, the reappearance in the framework of European federalism of expressions which were previously widely used in other ideological contexts."
Notons au passage, à propos d' avant-garde, la réapparition dans le cadre du fédéralisme européen ,d' expressions qui ont connu jadis une grande fortune dans d' autres contextes idéologiques.