Hello,

1- The translation is coming from the Woocommerce plugin not from the theme. Please ask the Woocommerce plugin support to check this translation issue for you.

2- The Sticky Header on your Site is already appearing with the change that you have mentioned.

For without Sticky Header, the change has been done with the help of the following Custom CSS applied:

body:not(.single-product) .whb-overcontent:not(.whb-sticked) .whb-row:not(.whb-with-bg) a {
    color: #fff;
}

body:not(.single-product) .whb-overcontent:not(.whb-sticked) .whb-row:not(.whb-with-bg) .wd-dropdown.wd-dropdown-menu.wd-dropdown-my-account .wd-sub-menu li a {
    color: #000;
}

body:not(.single-product) .whb-overcontent:not(.whb-sticked) .whb-row:not(.whb-with-bg) .wd-tools-element.wd-design-6>a>:is(.wd-tools-inner,.wd-tools-icon) {
    border-color: #fff;
}

Please check back your Site after completely clearing the browser and server cache.

Best Regards