Update textbook.en.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/10.math-tools/05.first-steps/textbook.en.md

@@ -1,13 +1,11 @@
 ---
-title: Brainstorming sur les outils mathématiques requis à chaque niveau
+title: Define the mathematical tools required at each level
 published: true
 routable: true
 visible: false
 lessons:
     - slug: define-g12-mathematical-tools
       order: 1
-    - slug: define-g-mathematical-tools-polyglot
-      order: 3
 ---
 
 #### Define the mathematical tools required at each level