Implement Two-factor authentication

resources/lang/en/strings.php

@@ -12,6 +12,7 @@ return [
     'password' => 'Password',
     'email' => 'Email',
     'whoops' => 'Whoops',
+    'failed' => 'Your request could not be processed. Please try again later.',
     'success' => 'Success',
     'location' => 'Location',
     'node' => 'Node',

resources/lang/en/validation.php

@@ -72,6 +72,7 @@ return [
         'array'   => 'The :attribute must contain :size items.',
     ],
     'string'               => 'The :attribute must be a string.',
+    'totp'                 => 'The totp token is invalid. Did it expire?',
     'timezone'             => 'The :attribute must be a valid zone.',
     'unique'               => 'The :attribute has already been taken.',
     'url'                  => 'The :attribute format is invalid.',