Update textbook.fr.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/40.n4/12.en/textbook.fr.md

@@ -6,6 +6,8 @@ visible: false
 lessons:
     - slug: define-234-mathematical-tools
       order: 3
+    - slug: define-4-mathematical-tools-polyglot
+      order: 1
 ---
 
 #### Define the mathematical tools required at level 4