All hardcoded strings replaced by i18n translation

app/Http/Controllers/UserController.php

@@ -17,15 +17,10 @@ class UserController extends Controller
      */
     public function login(Request $request)
     {
-
-        $messages = [
-            'email.exists' => 'No account found using this email',
-        ];
-
         $validator = Validator::make($request->all(), [
             'email' => 'required|exists:users,email',
             'password' => 'required',
-        ], $messages);
+        ]);
 
         if ($validator->fails()) {
             return response()->json(['error' => $validator->errors()], 400);