change checkout button text on woocommerce dropdown cart

hey,

I would like to change the checkout button text ‘Pénztár’ on dropdown cart to ‘Távább a fizetéshez’.
I use WPML and Woocommerce (up-to-date versions).

I try this code, but doesnt work:

/**
 * Change text strings
 *
 * @link http://codex.wordpress.org/Plugin_API/Filter_Reference/gettext
 */
function my_text_strings( $translated_text, $text, $domain ) {
    switch ( $translated_text ) {
        case 'Pénztár' :
            $translated_text = __( 'Tovább a fizetéshez', 'woocommerce' );
            break;
    }
    return $translated_text;
}
add_filter( 'gettext', 'my_text_strings', 20, 3 );

How can I solve this? Can you help me or this is a WPML issue?

Best regards
Peter