add english to enable localization with https://translate.yunohost.org

manifest.json

@@ -83,10 +83,11 @@
                 "name": "email",
                 "type": "email",
                 "ask": {
+                    "en": "Your mail address.",
                     "fr": "Votre adresse mail."
                 },
                 "exemple": "abc@efg.hi"
             }
         ]
     }
-}
+}