I created MUI custom page using InstallOptions with 2 fields, both with min text length defined. Setup popups MessageBox if field is empty (that is correct), but lang is wrong - default comp lang used. Another side of question I requested some time ago - disabled Next button (Kichik offered) if text length is less then defined and popup message not set.
Logged In: YES
user_id=584402
Originator: NO
Thanks, fixed.