Update cheatsheet.fr.md

00.brainstorming-pedagogical-teams/99.new-propositions/20.sets-systems/05.first-steps/cheatsheet.fr.md

@@ -4,17 +4,17 @@ published: true
 routable: true
 visible: false
 lessons: 
-   - slug: set-systems-g12-overview
+   - slug: sets-systems-g12-overview
      order: 1
-   - slug: set-systems-g12-brainstorming
+   - slug: sets-systems-g12-brainstorming
      order: 1
-   - slug: set-systems-mathtools-1
+   - slug: sets-systems-mathtools-1
      order: 3
-   - slug: set-systems-mathtools-2
+   - slug: sets-systems-mathtools-2
      order: 3
-   - slug: set-systems-mathtools-3
+   - slug: sets-systems-mathtools-3
      order: 3
-   - slug: set-systems-mathtools-4
+   - slug: sets-systems-mathtools-4
      order: 3
 ---