make inheritance for vue translations i18n.js files

By importing only the app i18n file,
we benefit from the whole inherited chain:

app i18n < chill bundle i18n < chill main bundle i18n

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

@@ -23,5 +23,3 @@ export default {
    ])
 };
 </script>
-
-<style scoped></style>

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

@@ -1,6 +1,5 @@
-import { datetimeFormats } from 'ChillPersonAssets/vuejs/_js/i18n'
+import { datetimeFormats, personMessages } from 'ChillPersonAssets/vuejs/_js/i18n'
 
-// TODO howto merge message object from import ??
 const messages = {
    fr: {
       title: {
@@ -22,26 +21,12 @@ const messages = {
          startdate: "Date d'entrée", 
          enddate: "Date de sortie",
          addPerson: "Ajouter un usager",
-      },
-      action: {
-         actions: "Actions",
-         show: "Voir",
-         edit: "Modifier",
-         create: "Créer",
-         remove: "Enlever",
-         delete: "Supprimer",
-         save: "Enregistrer",
-         showModal: "Ouvrir une modale",
-         ok: "OK",
-         cancel: "Annuler",
-         close: "Fermer",
-         next: "Suivant",
-         previous: "Précédent",
-         back: "Retour"
       }
    }
 };
 
+Object.assign(messages.fr, personMessages.fr);
+
 export {
    datetimeFormats,
    messages

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

@@ -16,9 +16,28 @@ const datetimeFormats = {
       }
    }
 };
-// const messages = {} ...
+const personMessages = {
+   fr: {
+      action: {
+         actions: "Actions",
+         show: "Voir",
+         edit: "Modifier",
+         create: "Créer",
+         remove: "Enlever",
+         delete: "Supprimer",
+         save: "Enregistrer",
+         showModal: "Ouvrir une modale",
+         ok: "OK",
+         cancel: "Annuler",
+         close: "Fermer",
+         next: "Suivant",
+         previous: "Précédent",
+         back: "Retour"
+      }
+   }
+}
 
 export {
    datetimeFormats,
-   // messages
+   personMessages
 };