I did this in style-blue.ini. I didn't imagine we need udm-custom.ini.
Anyway, I changed back the resources folder name to udm-resources and I put syle-blue.ini instead of udm-custom.ini in $config in udm-style.php and udm-dom.php (of course I removed it from the URLs in sytle-blie.php) and now it is working. So I don't know now, if it is the change of the folder name or a wrong path in the links in style-blue.php that was the problem.
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