This change can conflict for future updates however i have another solution for you.
Add this CSS in the end of file >> wp-content >> Plugins >> computer-repair-shop >> assets >> admin >> css >> style.css
Add at the end of this file.
#wc_order_info_id .button.button-primary.button-large:after {
display: block;
content: "Print Queue";
color: #FFF;
}
#wc_order_info_id .button.button-primary.button-large {
font-size:0px;
}
You can change the label to anything in this CSS class. thanks