Really nice contrib !
I don't know if someone pointed it but you should change this in sts_user_code.php :
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if ( (sizeof($category_tree_array) < 1) && ($exclude != '0') ) $category_tree_array[] = array('id' => '0', 'text' => "Catalog");
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to ->>
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if ( (sizeof($category_tree_array) < 1) && ($exclude != '0') ) $category_tree_array[] = array('id' => '0', 'text' => HEADER_TITLE_CATALOG);
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otherwise it will always print "Catalog" in the drop-down box ($catmenu) without taking care of the language
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GdCondor