1) How can I change text “Read more” in widget TH:Services?
2) What do you mean in TH:Services widget “Font Awesome Icon class”? Where can I take this class?
Yes you are correct. Currently we have only free version. You can make manual change in the theme. Go to theme folder -> template=parts -> widgets -> wowsome-widgets.php on line no 317. You can see the read more text. Change that text into your own language.
While updating to new version all your customized code will be lost so each and every time while you update the theme, the same code customization is required.