add already exists error

since it's already outputting a machine error i mapped it to check here instead of the html, since this is probably the only error that users will need to know about

API/Auth/auth.js

@@ -39,7 +39,7 @@ exports.register = async (req, res, next) => {
   } catch(error) {
     res.status(400).json({
       message: "User not successful created",
-      error: error.message,
+      error: error.message.includes("E11000") ? "as there is an account already with this name": error.message,
     });
   }
 };