add comments to all pieces

src/app/class/educationnal-objective/educationnal-objective.ts

 export class EducationnalObjective {
 
     objective: string = '';
-
+    comments: Comment[] = [];
 }

src/app/class/game-context/game-context.ts

@@ -5,5 +5,5 @@ export class GameContext {
     duration: string = '';
     intrigue: string = '';
     other: string = '';
-
+    comments: Comment[] = [];
 }

src/app/class/game-educationnal-objective/game-educationnal-objective.ts

 export class GameEducationnalObjective {
 
     objective: string = '';
-
+    comments: Comment[] = [];
 }

src/app/class/mission-context/mission-context.ts

@@ -3,5 +3,5 @@ export class MissionContext {
     duration: string = '';
     intrigue: string = '';
     other: string = '';
-
+    comments: Comment[] = [];
 }