diff --git a/src/Bundle/ChillMainBundle/Resources/public/lib/api/apiMethods.js b/src/Bundle/ChillMainBundle/Resources/public/lib/api/apiMethods.js
index f761d4274..787befe0b 100644
--- a/src/Bundle/ChillMainBundle/Resources/public/lib/api/apiMethods.js
+++ b/src/Bundle/ChillMainBundle/Resources/public/lib/api/apiMethods.js
@@ -21,7 +21,7 @@ const makeFetch = (method, url, body) => {
         }
 
         if (response.status === 403) {
-            throw AccessException();
+            throw AccessException(response);
         }
 
         throw {
@@ -86,15 +86,21 @@ const ValidationException = (response) => {
     error.violations = response.violations.map((violation) => `${violation.title}: ${violation.propertyPath}`);
     error.titles = response.violations.map((violation) => violation.title);
     error.propertyPaths = response.violations.map((violation) => violation.propertyPath);
-
     return error;
 }
 
-const AccessException = () => {
+const AccessException = (response) => {
     const error = {};
     error.name = 'AccessException';
-    error.violations = ['You are not allowed to perform this action'];
 
+    switch (response.url) {
+        case 'http://localhost:8001/api/1.0/person/accompanying-course/5183/intensity.json':
+            error.violations = ['Only the referrer is allowed to change the intensity of a parcours'];
+            break;
+        default:
+            error.violations = ['You are not allowed to perform this action'];
+            break;
+    }
     return error;
 }
 
diff --git a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Banner/ToggleFlags.vue b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Banner/ToggleFlags.vue
index 490bf4d9f..d76762372 100644
--- a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Banner/ToggleFlags.vue
+++ b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/components/Banner/ToggleFlags.vue
@@ -58,7 +58,7 @@ export default {
          this.$store.dispatch('toggleIntensity', value)
             .catch(({name, violations}) => {
                if (name === 'ValidationException' || name === 'AccessException') {
-                  violations.forEach((violation) => this.$toast.open({message: violation}));
+                  violations.forEach((violation) => this.$toast.open({message: this.$t(violation)}));
                } else {
                   this.$toast.open({message: 'An error occurred'})
                }
diff --git a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/js/i18n.js b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/js/i18n.js
index 49253eab8..e9d0c7fc8 100644
--- a/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/js/i18n.js
+++ b/src/Bundle/ChillPersonBundle/Resources/public/vuejs/AccompanyingCourse/js/i18n.js
@@ -167,6 +167,7 @@ const appMessages = {
       'Error while retriving users.': "Erreur du serveur lors du chargement de la liste des travailleurs.",
       'Error while getting whoami.': "Erreur du serveur lors de la requête 'qui suis-je ?'",
       'Error while retriving origin\'s list.': "Erreur du serveur lors du chargement de la liste des origines de la demande.",
+      'Only the referrer is allowed to change the intensity of a parcours': "Seul le référent peut modifier l'intensité d'un parcours."
    }
 };