household-members-editor: lightly improve ux (TO CHECK)

src/Bundle/ChillPersonBundle/Resources/public/vuejs/HouseholdMembersEditor/App.vue

@@ -15,7 +15,12 @@
   <confirmation v-if="step === 'confirm'"></confirmation>
 
   <ul class="record_actions sticky-form-buttons">
-    <li class="cancel" v-if="step !== 'concerned' || hasReturnPath">
+    <li class="cancel" v-if="step !== 'concerned'">
+      <button class="btn btn-cancel" @click="goToPrevious">
+        {{ $t('household_members_editor.app.previous') }}
+      </button>
+    </li>
+    <li class="cancel" v-else-if="hasReturnPath">
       <button class="btn btn-cancel" @click="goToPrevious">
         {{ $t('household_members_editor.app.cancel') }}
       </button>

src/Bundle/ChillPersonBundle/Resources/public/vuejs/HouseholdMembersEditor/components/CurrentHousehold.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="flex-table" v-if="hasHousehold">
+  <div class="flex-table mb-5" v-if="hasHousehold">
     <div class="item-bloc">
       <household-render-box :household="fakeHouseholdWithConcerned"></household-render-box>
     </div>

src/Bundle/ChillPersonBundle/Resources/public/vuejs/HouseholdMembersEditor/js/i18n.js

@@ -51,6 +51,7 @@ const appMessages = {
        },
       app: {
        next: 'Suivant',
+       previous: 'Précédent',
        cancel: 'Annuler',
        save: 'Enregistrer',
         steps: {