Installation as usual
Via /admin.php?add-ons/Xencafe-LangCaptcha/options
you can sort your questions from new to old or old to new (question_id) or by language in ascending or descending order.
Via Settings > User Registration > Question and Answer Captcha or /admin.php?captcha-questions/
you can create your questions.
Make sure that there is at least one question for each language. There is no warning message if you have forgotten a language, a registration in this language is then no longer possible.
If you create multiple questions for one language, the questions will be randomly selected.