Hi RomaPopovych,
1.You can change button color by add below code to Claue > Theme Option > General Layout > Custom CSS
.jas-mini-cart .button, .widget_shopping_cart .button {
background: #222;
color: #fff;
}
and change #222, #fff with your color code
2. Please go to Loco > themes > claue > edit template > sync > save https://prnt.sc/vnaois
and after that back to translate.
Kind regards
Harry
Premium Wordpress themes and plugins, Best WooCommerce theme https://themeforest.net/user/janstudio/portfolio?ref=janstudio