flowful

I was able to make it work with same code after all. The Email and Password and Login were case sensitive, and it didn’t work when I typed them all with small letters..

For people with same problems who find this, type this code into your child themes functions.php

//Change the Create Account checkout text
function wc_create_account_field_strings( $translated_text, $text, $domain ) {
switch ( $translated_text ) {
case 'If you have shopped with us before, please enter your details below. If you are a new customer, please proceed to the Billing section.' :
$translated_text = __( 'Jos olet asioinut kanssamme aiemmin, kirjaudu sis??n t?st?. Jos olet uusi asiakas, siirry seuraavaan osioon.', 'woocommerce' );
break;
}
return $translated_text;
}
add_filter( 'gettext', 'wc_create_account_field_strings', 20, 3 );

function change_lost_your_password ($text) {

             if ($text == 'Lost your password?'){
                 $text = 'Unohtuiko salasana?';

             }
                    return $text;
             }
    add_filter( 'gettext', 'change_lost_your_password' );

function change_remember_me ($text) {

             if ($text == 'Remember me'){
                 $text = 'Muista minut';

             }
                    return $text;
             }
    add_filter( 'gettext', 'change_remember_me' );

function change_email ($text) {

             if ($text == 'Email'){
                 $text = 'S?hk?posti';

             }
                    return $text;
             }
    add_filter( 'gettext', 'change_email' );

function change_password ($text) {

             if ($text == 'Password'){
                 $text = 'Salasana';

             }
                    return $text;
             }
    add_filter( 'gettext', 'change_password' );

function change_login ($text) {

             if ($text == 'Login'){
                 $text = 'Kirjaudu';

             }
                    return $text;
             }
    add_filter( 'gettext', 'change_login' );

You might have to play around with Login button’s size through custom CSS maybe..?