Profile Builder with Polylang

The question is solved. There are Field name “Username” in both languages registered forms – Eng. & Rus. And now I want change field names in Rus. form.
1)I changed Label names in Manage Fields like this – https://www.cozmoslabs.com/docs/profile-builder-2/developers-knowledge-base/support-themes-plugins/shortcode-add-support-polylang-plugin/
2)Added to top (before [wpbp-register]) shortcode [wppb_polylang_compat] in both linked pages (Eng. & Rus.)
3)Added script from https://www.cozmoslabs.com/docs/profile-builder-2/developers-knowledge-base/support-themes-plugins/shortcode-add-support-polylang-plugin/ to …profile-builder\features\function.php

And now I have empty fills instead “Username” and “Имя пользователя” ??

Hello there,

If you do not have a lot of strings to translate, I suggest using Weglot. You could also use WPML which is compatible with Profile Builder.

I am not sure with what I should help you here. Can you explain it to me ?

With step number 3 of your second message maybe you corrupted our files. Do not ever insert code inside Profile Builder files.
We recommend the insertion of custom code as explained at the top of this page.

To return them to default, you should just do the changes again. You changed the Field Titles in Profile Builder -> Manage Fields to what was suggested in the link present at #1.
Revert that.

Best Regards,