Update textbook.en.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/30.classical-mechanics/05.first-steps/textbook.en.md

 ---
-title: Brainstorming pour structurer une thème "Mécanique classique"
+title: Brainstorming to structure a theme "classical mechanics"
 published: true
 routable: true
 visible: false
@@ -9,8 +9,8 @@ lessons:
       order: 1
 ---
 
-#### Brainstorming général, pour structurer un thème "Mécanique classique", 
-tous les niveaux confondus
+#### Overall brainstorming to structure a theme "classical mechanics", 
+for all levels.
 
 --------------------
 
@@ -43,29 +43,25 @@ The different proposals are numbered: they start with :
 _(BRST-MEC-CLAS1 pour Brainstorming STructure MEChanics CLASsical level 1)_
 
 To **add an item, create it** in or after existing items (following the logical order).
-To do this, start your proposition with: <br>
-* new *[BRST-MECACLAS1-number] + (three initials in brackets representing you) + Title*
+To do this, start your proposition with a new : <br>
+* *[BRST-MECACLAS1-number] + (three initials in brackets representing you) + Title*
 
 To **react to an existing item*, add your comment after the others
 starting with three initials in brackets that represent you :
 (CLM): previous comment.<br>
 *(my initials): my comment* 
 
-Pour **ajouter une proposition, créez la** dans ou à la suite (suivant la logique de la proposition)
-des propositions existantes. Pour cela, commencer par :<br>
-*nouveau [BRST-MECACLAS1-numéro] + (trois initiales entre parenthèse vous représentants) + Titre*
-
-To ** communicate my proposals **, either:
-* Directly on the ** GitLab M3P2 **:
+To **communicate my proposals**, either:
+* Directly on the **GitLab M3P2**:
 <details>
 <summary> More information </summary>
 Only for those who have an M3P2 account and have received the little introduction to Git: <br>
-   * Click "Améliorer ce cours" at the bottom of the page.
-   * Login with your username / password
+* Click "Améliorer ce cours" at the bottom of the page.
+* Login with your username / password
 </details>
 
 <br>
-* On the **Google Docs**: to be specified.
+* On the **Google Docs M3P2**: to be specified.
 
 The Gitlab will be kept up to date with your proposals, also translated into English and Spanish.<br>
 _(This is not required, but if you can also make your contribution in French, more in_