Change slug for category name

Hi, I need to show the category name instead of the slug, at the ‘gallery-category’… May I have to change the ‘slug’ of the last line? can you help me?

$gallery_category = array(
        'hierarchical' => true,
        'labels' => array(
            'name' => _x( 'Gallery Category', 'taxonomy general name' ,'theme' ),
            'singular_name' => _x( 'Gallery Categories', 'taxonomy singular name','theme' ),
            'search_items' =>  __( 'Search Categories', 'theme' ),
            'all_items' => __( 'All Categories', 'theme' ),
            'parent_item' => __( 'Parent Category', 'theme' ),
            'parent_item_colon' => __( 'Parent Category:', 'heme' ),
            'edit_item' => __( 'Edit Category', 'theme' ),
            'update_item' => __( 'Update Category', 'theme' ),
            'add_new_item' => __( 'Add New Category', 'theme' ),
            'new_item_name' => __( 'New Category Name', 'theme' ),
            'menu_name' => __( 'Category', 'theme' ),
        ),
        'show_ui' => true,
        'query_var' => true,
        'rewrite' => array( 'slug' => 'gallery-category' ),
    );

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