"Default language setting in wordpress site should be applied to Nickname input field validation function in [bp-xprofile-filters.php] file. Validation on Nickname field will deny any unicode text for foreign languages such as Arabic and any Asian text. Please allow unicode range for non-roman characters or make variable grep for Wordpress default locale setup in next update. PS I will change the function's GREP equation in PHP file and put it in buddy boss-theme-child folder