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add_action( 'init', array( $this, 'set_pagination_base' ) );
/**
 * Set pagination base for NL sites.
 */
function set_pagination_base() {

if ( 'nl_NL' === get_locale() ) {
	global $wp_rewrite;
	if ( 'pagina' !== $wp_rewrite->pagination_base ) {
			$wp_rewrite->pagination_base = 'pagina';
			$wp_rewrite->flush_rules();
		}
	}

}