How to change Form “Submitting” text

[tuanphan]

You can use this code to Custom CSS box

button[aria-live="polite"] span.form-submit-button-label {
    font-size: 0 !important;
}
button[aria-live="polite"] span.form-submit-button-label:before {
    content: "enter new french text";
    font-size: 16px !important;
}

result