Improved login redirect and setup experience

- Updated auth system for mfa to not update intended URL so that the
  user is not redirected to mfa setup after eventual login.
- Added notification for users setting up MFA, after setup when
  redirected back to login screen to advise that MFA setup was complete
  but they need to login again.
- Updated some bits of wording to display better.

app/Http/Controllers/Auth/MfaTotpController.php

@@ -61,6 +61,11 @@ class MfaTotpController extends Controller
         session()->remove(static::SETUP_SECRET_SESSION_KEY);
         $this->logActivity(ActivityType::MFA_SETUP_METHOD, 'totp');
 
+        if (!auth()->check()) {
+            $this->showSuccessNotification(trans('auth.mfa_setup_login_notification'));
+            return redirect('/login');
+        }
+
         return redirect('/mfa/setup');
     }