Hello,
There is no such hook.
As was mentioned, you can disable and delete the Loco plugin once the text will be changed.
Or use can use custom CSS code (Theme Options > Theme custom CSS):
.etheme-ajax-filter.etheme-sale-filter {
font-size: 0;
}
.etheme-ajax-filter.etheme-sale-filter:after {
content: 'My custom text';
font-size: 1.14rem;
}
Regards