add alert for not-in-household and actions in page

accompanyingCourse/summary

* alert for people not in household for each accompanying course;
* style for action in alert
* form to members editor

src/Bundle/ChillPersonBundle/translations/messages+intl-icu.fr.yaml

@@ -8,6 +8,8 @@ Born the date: >-
 household:
     Household: Ménage
     Household members: Membres du ménage
+    Household editor: Modifier l'appartenance
+    Select people to move: Choisir les usagers
     Show future or past memberships: >-
         {length, plural,
             one {Montrer une ancienne appartenance}