Try
add this to the custom CSS
.item-reply Button::before {
content: "\f3e5";
font-family: "Font Awesome 5 Free";
font-weight: 900;
}
.item-reply Button span{
display: none
}
.item-like Button::before {
content: "\f164";
font-family: "Font Awesome 5 Free";
font-weight: 900;
}
.item-like Button span{
display: none
}
