Have the auth notice only take up one line (pterodactyl#631)

Author: lancepioch

resources/lang/en/auth.php

@@ -3,7 +3,7 @@
 return [
     'not_authorized' => 'You are not authorized to perform this action.',
     'auth_error' => 'There was an error while attempting to login.',
-    'authentication_required' => 'Authentication is required in order to continue.',
+    'authentication_required' => 'Authentication is required to continue.',
     'remember_me' => 'Remember Me',
     'sign_in' => 'Sign In',
     'forgot_password' => 'I\'ve forgotten my password!',