Updated translation.

translations/fr-fr.all.json

@@ -127,6 +127,10 @@
     "id": "captcha",
     "translation": "Captcha"
   },
+  {
+    "id": "captcha_audio",
+    "translation": "Captcha Audio"
+  },
   {
     "id": "bad_captcha",
     "translation": "Mauvais captcha !"