Hello,
1. You can use translation (for example Loco Translate plugin) to change the text without editing php files –http://prntscr.com/o0ro8f https://prnt.sc/o0ro3p Create English translation, change desired strings of WooPress theme and disable the Loco translate plugin.
2. http://prntscr.com/o0rqg5 > https://prnt.sc/o0rqak
.label-product .out-stock {
transform: rotate(320deg);
border-radius: 0;
width: 140px;
height: auto;
left: 6px;
top: 50px;
right: auto;
}
.label-product .wr-c {
margin-top: 0px;
padding: 8px 0px;
}
.out-stock .wr-c .bigT {
font-size: 14px;
font-weight: 700;
}
Regards