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multumesc de raspuns, totusi da eroare:

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/category-template.php on line 37

sper sa te ajute.
wp-includes/category-template.php

cauta
$catlink = str_replace( '%category%', $category_nicename, $catlink );
adauga dupa el
$p = get_category_parents( $category->parent, false, '/', true );
$catlink = str_replace($p, '', $catlink);