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add_action('do_meta_boxes', 'change_image_box');
function change_image_box()
{
	remove_meta_box( 'postimagediv', 'cover', 'side' );
	add_meta_box('postimagediv', __('Обложка журнала'), 'post_thumbnail_meta_box', 'cover', 'normal', 'high');
}