How to translate intro text article

I will have a look on that shortly, sorry for waiting.

Hello,

It has been fixed now. AJAX Register v3.6.8 will support translation of the intro text.
You assign the article in default language (e.g. English) to be intro article in AJAX Register options. Then you create articles in additional languages and associate them with your main intro article. AJAX Register will automatically show the translated article as soon as you switch the language.

Again, sorry that you had to wait a bit on this. Let me know if you need any more help.