Set frontend's logic to modify the avatar

This commit does not set the logic to modify the avatar in the backend. It does not even set the logic to retrieve the avatar from the backend.

Change-Id: I1a787742a956218d150d69cc5ccc90b59e296b1f
diff --git a/client/src/locale/fr/translation.json b/client/src/locale/fr/translation.json
index 7250e0e..44d0517 100644
--- a/client/src/locale/fr/translation.json
+++ b/client/src/locale/fr/translation.json
@@ -1,5 +1,6 @@
 {
   "severity": "",
+  "change_picture": "Modifier l'image",
   "ongoing_call_unmuted": "Appel en cours",
   "ongoing_call_muted": "Appel en cours (muet)",
   "connecting_call": "Connexion...",