translate_to_german.php

<?php

function my_pmpro_translate_to_german($translated_text, $original_text, $domain) {
	
	switch ( $translated_text ) {
            case 'Check Out with a Credit Card Here' :
                $translated_text = __( 'Translation in German Here', 'paid-memberships-pro' );
                break;
    }
    return $translated_text;
}
add_filter( 'gettext', 'my_pmpro_translate_to_german', 10, 3 );