Followup
So, I have to live with that therefore I'm looking for a solution.
I was thinking of having an added text on the registration page with an explanation to the user that the user name must be in English.
Is it possible to do that:
1. Create a standard WP page
2. Add 1-2 lines of text
3. add a shortcode for the registration page. in the docs you have that:
/%wpforo-register%/ as a link in a menu item and I'm looking for something like that - [wpforo-register] with a text above it just like in the main page of the forum [wpforo] where you have an option to add text on top or at the end.
In the meanwhile I solved it by changing the text in the phrase editor.
But it will good to know if a wp page with a shortcode will work for that purpose and all other wpForo menu iterms.
Thank you
There is no way to do this with new page. You should put the message in wpForo registration template file.
Create a /wpforo/ folder in active WordPress theme folder. Then copy register.php from /wpforo/wpf-themes/classic/ directory and paste in theme's /wpforo/ folder. Then open it in some text editor and add the text here:
More info how to customize theme files you can find here:
Thank you