feat(settings/user/birthday): implement

i18n/locales/en.json

@@ -35,6 +35,14 @@
         "title": "Color",
         "description": "Select your favorite color.",
         "confirmation": "Color setting saved."
+      },
+      "birthday": {
+        "title": "Birthday",
+        "description": "This is my birthday.",
+        "confirmation": {
+          "today": "Yes, it's today!",
+          "future": "Don’t forget to wish me in {days} days!"
+        }
       }
     },
     "touchScreen": {