Login/Logout + Menu + i18next

exam/react/public/locales/en/translation.json

@@ -0,0 +1,11 @@
+{
+  "NotFound_user:login": "User does not exist",
+  "Unauthorized:login": "Invalid e-mail or password",
+
+  "GuestBook": "GuestBook",
+  "E-Mail": "E-Mail",
+  "Password": "Password",
+  "Log in": "Log in",
+  "Log out": "Log out",
+  "Profile": "Profile"
+}