I really like the theme and I just have one little question:
I want to change the text like “Reccently added item(s)” and button text of the cart widget popup. Where can I do that? (I have already changed the english describtions in the cart.php but I can’t find the labels for that cart widget).
Yes, @mtc is right. You don’t need to do changes in theme files it would be better to use translation. Install and activate Loco Translate plugin. Go to Loco Translate > Themes > XStore > create the new translation for your language and instead of real translation just use translation field to change strings to what you need.