fix logout message in line with issue 102

src/app/logout/logout.component.html

@@ -3,7 +3,7 @@
     <div class="heading"><h1>Log out</h1></div>
     <mat-divider></mat-divider>
     <div>&nbsp;</div>
-    <p>Log out of Strudel?</p>
+    <p>Are you sure you want to logout from strudel?</p>
     <div fxLayoutAlign="space-between start">
         <button mat-flat-button color=primary class="big-button" (click)="logout()">Logout</button>
         <button mat-flat-button color=primary class="big-button" routerLink="/launch">Cancel</button>